I don't see what the big deal is. A bra is just as covering as a bikini. It's definitely not child porn. If she's comfortable with her body and want's to show it off, I don't think it's wrong. It's normal to want to feel attractive and want a little attention and reaffirmation. Yeah she's young, but she's hardly a child. She is, or is past, the age of consent in most states. If she is old enough to transition I think she is old enough to make any other decision regarding her body. How you look does show your personality. Attraction to physical beauty is an instinct. She can be a nudist and still get a good guys attention. Obviously being attractive will reel in more attention from guys in general, both bad and good. I don't think just wanting sex automatically makes someone a bad person either.