Oh, thanks. That is interesting.

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I rewatched the ending last night. It is odd how she just disappears from the film after that line. But it's daylight when she says it and night time when they revive the monster. That's several hours in which she could have left.
I guess maybe she felt he was in good hands since Mannering was a doctor and there to help. (Unfortunately, he decided to help the monster instead.)

Okay thanks, that makes sense. I assumed she had left too, but I wondered just because as you said, I found it odd for her to just sort of disappear from the film.

She had left by that point. At the end, it was only Dr. Mannering, Baroness Frankenstein, and the two patients who were in the castle. It is kind of odd for her to disappear off-camera after delivering the line that Larry Talbot is not insane, but I can only imagine she chose to head back to her troupe rather than stay and watch Larry die.