I Am Confused About This Girl In My Class

Before two weeks i went with my classmates to a meeting of the class in a restaurant. But i went there one hour late and a girl from my class came to me and kissed me.

She is very shy and this was unusual for her, except that she was drunk a little (i smelled the scent of alcohol from her mouth). After that we went to the restaurant and sat on one table together.

I was hugging her while we talked and she bought another drink. After the meeting ended i said goodbye to her and hugged her for the last time...The next day in school she said to me a couple of words and pretended that nothing happened.

Now when i saw her on the streets she is ignoring me when i say hi to her. My old skype account was deleted and i started a new account. Then i added her and she refused to write to me and add me to her list of subscribers.

Please answer my question im confused.