Why would she ignore me now if she was never interested in me in the first place?

I'm having kind of the same problem. What I'm trying to do is talk to her more because she's not really ignoring me, she still responds when i say "Hi". But if your situation is even worse than mine, I'm very sorry to say, but you have to move on :(. That's what I might have to do soon. I'd suggest to try to move on by getting into a good video game and talk about it with your friends. That's what I'm going to be having to do if my last tries don't work :(.