There is no way she doens't know, right?

Nah, women think differently than men. She really might not know! My advice to you is to get to know her a little better. See if you gradually start talking more and more. If you do, you've got something there! Ask her to talk on the phone, get her number, and casually ask her out after a few phone calls. You need to let her feelings build for you, don't just rush and ask her prematurely, it might freak her out. Women like forward, but not aggressive men.