Help! Dating Question

OK, so I have a very specific situation that I need advice on and I thought maybe you could help. I'm a closeted trans lesbian and I really like this girl that goes to my drama club. I don't know if she's straight or bi but I'm pretty sure she likes guys. So I don't know whether to ask her out now as I would have a better chance just now and potentially end up having to break up with her when I come out (if she's straight) or whether to wait till I come out and just take the risk of whether she's straight or bi.