lol im bi, but tbh if she likes boys and girls then you just got to know shes got that will power to stick with one (I do) and if you trust her then go ahead :)
Well if she's bi,She likes boys AND girls.SO it shouldnt really matter to her. Ask her the same way youd ask a straight girl.
Just ask her. The only difference is that u got 2wice the competion so go ahead and do it. Hurrry
Ask her any ways shes still a person