Is she gay?

I have a friend whose very athletic and cute and I think she's bi/gay, but I don't know for sure yet.  Because I remember coming up to here and her bff and hearing her talk about this girl on her swim team who has a crush on her and she didn't look disgusted or anything even though her bff was.  And she and her bff have been drifting apart this past month and no one knows why.

And when my friends were chanting "_____ loves Mattison", she thought he was a girl (due to the name haha) and she looked kind of happy when she asked me if I really liked her.  And then she seemed kind of disappointed when I told her he was a boy who I didn't like at all.

So...I don't really know... ... ...

pheonixflyinghigh,
it can be easy or hard to tell if someone is gay or bi. As i dont know her it is kind of hard to be able to tell. As far as that girl liking her if she didnt look disgusted she is either gay/bi or very understanding.
I think that the possibility of her friend being not very understanding of the fact that a girl likes her may be making them drift apart, the possibility is quite high.

I'm not a big problem if someone is gay or lb