I think she might have been transferring. Although, I might be incorrect and would need to read the last chapter again.

However, since I am not sure about that, I will agree that it is odd, but not enough to where I feel that it does not represent the experience. What I will say is that the author never spoke about it in the last chapter, which would have done it some justification if there were some ramifications. If I put myself in Kate’s shoes, I probably would not be nearly upset. You cannot hide it forever in school, not unless you transition after graduating. I suppose you can transfer, but realistically, who can do that? Between having someone call her out in school versus an exclusive, small place where not everyone in her school was there, the second one sounds like the lesser of two evils. That does not mean I am defending it, though. Since I have to do guesswork that the author should have explained, this point is valid, and I agree with you.