if they're opened being bisexual, they'd be opened if you have a chat with her. get to know her, be interested in her, talk about life, sooner and later they'll be opened about their sexuality.
and sooner or later they'll be sleeping with you? haha.. jking.. think its a nice suggestion to just talk/ ask about it.. if their open about it that is.
Being bisexual is no big deal... so many big movie stars and singers are ... Leslie was one too ...not to mention Elton John... both were interested in girls when they were young but turn to men later on in life... I guess the paparazzi may have played a great part in changing the sexuality of movie/pop stars.. they just do not have the privacy of going out with members of the other sex.. and after years of hanging out with the same friends, they fall in love and become homosexuals/lesbians...
haha, u cant reli tell if a gal is Bi coz she will still act girly i reckon. but i know quite alot of gals are. no harm, init?