Don't worry, she is not really crazy, she's probably nervous around you.
You should tell her soon enough that you do not like that kind of attitude around you if she is ever gonna hang around you.
But as you experienced, instead of liking someone, you should try to get to know people before you make a decisions, or you might end up here again!
Tell her what you feel and as soon as possible, waiting too long might be problemous for both you and her!
Sorry, but it seems to be the only solution :l