D.P.
hi R., I have 16 yr old twin daughters and one went through a phase thinking she was a lesbian or bisexual. They're young, they're experimenting. And I've always said what you say, "whatever makes you happy". Just love your daughter and give her time to figure out who she is. If you give her extra attention because she thinks she's bisexual, then she'll continue the behavior for the attention. Think back to when you were a teenager...we probably all had odd crushes, on teachers, friends' older brothers or fathers, etc. Good luck!