Well, when you see her in college you don't have to act in a certain way. You just have to be yourself and pretend that everything's normal. Don't show any insecurities because she will sense it. Be friendly and see if you can carry a casual conversation. On the close, you can then throw in the idea of a coffee if things are going good.
I would drop the idea of using this meeting as a way to hook up instantly. gunsnglory is right on the post he made above. You need to rebuild alpha status first or else she's going to shake you off.