It's good that she's accepting of trans people, but wouldn't what really matters be her sexual or romantic orientation? I'm assuming you want this relationship with her, but if she's not attracted to women then you probably shouldn't date. Honesty is important in relationships, and it's not healthy to keep your identity a secret while you're dating someone, especially if multiple other people know. I don't want to say anything ignorant because I only know what you've told me, but it's not fair for a woman to date a straight woman by passing as a man, and if that's the case in this relationship I think it would be better if you were friends.