I need some advice..?

ok there's this girl at my school and I've heard she's a . and her facebook doesn't say she's attracted to men (or women) so that doesn't get me anywhere. anyway, I've heard she made out with a chick at a party and I don't think she's ever dated a guy. she's a junior and I'm a senior and I never really talk to her. she's in my physics cl and she sits across from me. I think she's pretty and all that jazz, and I'd like to.. well, do some stuff with her. :) point is, what's the best way I could subtly find out if she's into the chickies? she's a swell gal and I don't know her that well, I just admire from afar. I don't want to wig her out in case she's not. help please. :)