Replying to Girl help!

Ok, so there is this girl that I really really like. I mean, I have never been so sure about liking someone before. Anyway, yesterday I asked her out over the weekend and she said sunday works. That was as far as we got because she needed to go to class. Anyway, I see her today, and she says nothing to me. Just sort of a glance in my direction and thats it. Pretty much, Im clueless as to whats going on. Should I try to ask her whats going on, or do you think it is better to leave her alone for a while?
I also just texted her friend to ask her if she was mad at me, and have not gotten any response yet.