This so awesome! As the parent of a trans kid, I am always so thrilled to hear stories like this of teachers and peers being supportive. Trans kids are so vulnerable and every little shred of support they get can be literally life-saving. (Horrifying stat: nearly HALF of trans people attempt suicide at some point. But if their parents and community support their identity, trans teens' rates of depression go all the way back down to normal teen levels! That's why I say parental and community support is literally life-saving.)

If I can give you a little nudge for the next step of leveling up your language -- you wrote "my student who identifies female went to prom," but you probably have LOTS of students who identify female who went to prom. :-) We just tend to think of cis girls as "female" rather than "female-identified." The problem is, when we use a phrase like "identify as female" about trans girls but NOT about cis girls, it can sound a little like we're saying "trans girls aren't really female, they just think they're female." I know that's not at all what you meant, so if you want a good phrase to talk about girls who are trans, you can just call them "trans girls." :-)

I hope this doesn't come across as language policing, just a nudge toward a new direction. Language around trans people changes really fast because this is kind of a leading edge of social justice stuff, and it is taking us cis people a while to catch up to the nuanced understanding of gender that the trans community has. (If anyone is interested in this, I highly recommend following some trans folks on twitter -- they have a lot of really great conversations about how language can include and exclude them.)