I guess you could find a book about a person going through hardship, their parents disowning them, friends leaving, but only having one, and tell them that it could be interpreted as a metaphor for being trans and what trans people could go through. At times, Sarah Mussi's "Siege" could be good, but maybe not. Anyhows I don't know of any, but, if I find any in the library today, I'll let you know.
All the best,
Susan's local YA lover
Natty