Totally get that feeling... U want to but u don't. But if u don't then you'll be on edge. Etc. sorry... I think you should try and enjoy yourself and if u see her, great, u can say hi. If not, then... That's too bad. But it shouldn't ruin your whole day I hope.

One thing to keep in mind is that I think if she sees u, she has to wait for you to make the first move. She can't acknowledge u until u give her a clue.