There're two possibilities to your situation: a) She's ashamed of that night and doesn't know how to approach thus closing off to you, or b) she thinks you're gay for not taking advantage of her while drunk and slutty.
The latter one is kinda fucked up, but a lot of girls in our generation think like this now: if a guy doesn't want me 'cause I'm hot and I'm crazy while drunk, then he must be gay.
