It's pretty obvious that the significance of the last scene is that Sadie "forgives" Jane for staying with her because of the money (guilt/selfishness), as she had her own selfish reasons for staying with Jane as well (taking the place of her lost daughter, who was the same age).
Bottom line, the reasons don't matter, what's important is that they each gained a friend.

Her husband didn't propose to her at the zoo in the 60's According to Jane, the zoo closed in 1965. He proposed to her much sooner than that. Sadi was just thrown because she hadn't been back to the zoo since before it closed, and hadn't realized that a place that meant so much to her was basically gone.
My take on the significance of the cemetery scene is similar to others. What Melissa didn't realize is that though guilt propelled Jane to approach Sadi after she found the money, it wasn't what motivated her to keep come back, especially after she maced her, and again when she pushed her away after the dog incident.
I felt Sadi was a proxy for her mom, since they appear to have a rocky relationshipshe invited her mom to come to CA, and she declined even though Jane was paying for it. I'm guessing her mom knows about the porn and was rejecting her for it. I think Sadi wanted her go to the tombstone, so she would know that she had daughter she hadn't told Jane about. It was her way of letting Jane know that she reminded her of her daughter, so both women were getting something out of the relationship, not just Jane.

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WOW, all these people digging so deep into the last scene, and seemingly missing the point, at least in my opinion.
To me, Sadie sending Jane to the grave was her way of telling Jane "I had a daughter and she was about your age when she died". I don't think it was some profound declaration of poverty or blood relationship and such. Just a way of telling someone Sadie had come to like something about herself she hadn't previously said. Had nothing to do with the money or Melissa's visit.
Sometimes, as cigar is just a cigar.

I think it just made her realize that she meant a lot more than she thought to the old lady, as if the woman she telling her 'you're really important to me, I hope you really are my friend and not faking' (relating to what melissa told her earlier)

then why was Jane having such a big revelation after she saw the tombstones?

Yes, I can't believe how many people were "whooshed" by this film. Good grief people.
I like it, it was a good movie.
And seemingly everyone has completely missed the fact that Jane was essentially lacking a mother. At the beginning of the movie Jane begs her mom to come to California and visit her, but she will not come visit her daughter and Jane is upset. She later mentions her mother pops 10 pills a day, and is thus probably a drug addict and an absent parent.
The grave scene is clearly showing that each of them are missing family in their lives. The old lady used to have a daughter and Jane has an absent mother.

WOW, all these people digging so deep into the last scene, and seemingly missing the point, at least in my opinion.
To me, Sadie sending Jane to the grave was her way of telling Jane "I had a daughter and she was about your age when she died". I don't think it was some profound declaration of poverty or blood relationship and such. Just a way of telling someone Sadie had come to like something about herself she hadn't previously said. Had nothing to do with the money or Melissa's visit.
Sometimes, as cigar is just a cigar.

She said 3 months since she gave up her license and stop driving.

Sadie said her husband died last year, so she's been in denial for the past 40 years.
She didn't say her husband died last year, she said that it had been a year since she visited her husband's grave, because she had turned in her license and no longer drove.

This is my ten cents
Sadie's daughter died in 1969, which meant she died when she was 18, either from an accident or suicide.
Sadie's husband died in 1971, 2 years after their daughter's death, either from a heart attack from the stress of the daughter's death, or suicide. I think his death is directly related to the daughter's death.
Sadie said her husband died last year, so she's been in denial for the past 40 years. She's never come to terms with her daughter's death, so much so she doesn't even admit to her daughter being alive.
I don't think there is more interpretation implied other than Sadie's life has a messy and sad past, and the introduction of Jane has pulled her out of her denial.
The relationship with Jane marks the first time in a long time she has started living life, which includes hopes & dreams (trip to Paris), sadness & stress (ordeal of Starlet getting lost), adventure (the trip to the porn office), and happiness (daughter-relationship with Jane).
Your interpretation seems to make the most sense. I totally missed that Sadie's husband had died much earlier than she mentioned. So Jane actually brought her out of her fantasy world and back to reality. Still seemed like a strange way to end the film considering everything that went on.

This is my ten cents
Sadie's daughter died in 1969, which meant she died when she was 18, either from an accident or suicide.
Sadie's husband died in 1971, 2 years after their daughter's death, either from a heart attack from the stress of the daughter's death, or suicide. I think his death is directly related to the daughter's death.
Sadie said her husband died last year, so she's been in denial for the past 40 years. She's never come to terms with her daughter's death, so much so she doesn't even admit to her daughter being alive.
I don't think there is more interpretation implied other than Sadie's life has a messy and sad past, and the introduction of Jane has pulled her out of her denial.
The relationship with Jane marks the first time in a long time she has started living life, which includes hopes & dreams (trip to Paris), sadness & stress (ordeal of Starlet getting lost), adventure (the trip to the porn office), and happiness (daughter-relationship with Jane).

Sadie never said he proposed to her in the 60s. Jane merely informed her that "in the 60s" was when the zoo had closed (which Sadie was unaware of).
The sky is
blue

The one little thing that nobody on this thread seemed to pick up on is that the flowers Sadie sent her to the grave with were black eyed Susans..Jane's favorite flower.

what do you mean this was the old woman's way of saying "I'm not different than you?" what was?

I just watched this movie on Netflix and that was exactly how I read the ending as well.

how would Jane seeing those tombstones make her know that the old woman was guilty?

100% accurated comment about the ending!

Maybe because she haved ten thousand from the lady? Is not this the main visible argument?

Why was Sadie guilty?

Very surprised out of all the people on here, you're the only one that got it. I thought it was fairly heavy-handed people. Sadie's daughter passed when she wasn't all that far from Jane's age. I think, obviously, Jane reminded Sadie of her daughter - and sending Jane to the grave wasn't about telling Jane that she knew about the money, but giving Jane an opportunity to let go of the guilt - because she, Sadie, was also guilty.
Beautiful film. Seriously - marvelous. And a brilliant ending.

I think that, after Jane's friend outed her to Sadie, Sadie felt betrayedat first. I think she then realized that maybe she was enjoying Jane's company for her own "selfish" reasons (Maybe Jane reminded her of her daughter.) Everyone watched the film feeling bad for Sadie and judging Jane for keeping her money and hanging out with her out of guilt, but I think that this was Sadie's way of saying "I'm no different than you" and, more importantly, "I know about the money and I forgive you." I don't know, that's just how I took it.

if the old lady really wanted to go to Paris then why did she at first say a resounding no to Jane? I mean Jane had to really talk her into it and even after that she had to try to win at Bingo in order to get the old lady to go with her.

at first she probably just felt guilty for taking her money, then most likely realized she was attached to the old lady and wanted to keep her company