Transsexual

Grow up. It's not hard to tell at all and you just want to be a smart a** because you don't like that she has short hair. Again, grow up and don't be an idiot.
If you truly couldn't tell, you either need new glasses or have the IQ of a piece of cat litter.
The plural of mouse is mice. The plural of goose is geese. Why is the plural of moose not meese?

She looks like a little sissy boy!
check out this picture:
http://www4.pictures.stylebistro.com/bg/Total+Recall+premieres+in+NYC+iq9Ix77he_fx.jpg

Why are you so fixated on her gender affiliation?

She's wearing a freaking skirt for christ sake

She is wearing clothes that are boyish, has boyish hair, and her name is Sami. When I had a pixie cut, forced on me as a child, everyone thought I was a boy. It was not good for my self esteem. Now had I WANTED to be gender neutral then that would have been a great style. So no rock needed to be confused.
I just want to add that [non gender neutral] girls I know who cut their hair that short do it because they feel they are beautiful enough to carry it off. No girl who feels plain or homely would cut her hair like that, unless again, she is gender neutral.
I will have long hair (at least shoulder length) until I die.
Do you think this looks like a girl or a feminine boy?
https://www.pinterest.com/pin/357121445433712549/

you never heard of the name Nicole, sometimes shortened to Nikki? What log have you been living under?

I just went on the IMDb page for "My Sister's Sister" and saw a thumbnail picture of this girl and only clicked on it because I wanted to know if it was a girl or a boy in the picture. With the very elfin features and short hair, it does make it very hard to tell. The name "Sami" being unisex doesn't help much either! lol x
"Run awayrun away and never return"

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She's a girl.
I can understand your confusion, though. With her hair and her character's name on "Blue Bloods", I wasn't sure myself.