Ask her about the show you just recieved, you have nothing to lose.

Since you're about to pretty much reveal to her what you witnessed a few moments ago, in case she doesnt already know, you let your eyes roam over her body before looking her straight in the eyes. "I was just curious, were you aware of that little show you gave me while you were digging around in your car a few minutes ago?", you ask, hoping to yourself, but not believing that she did it on purpose.

She gives you a small smile before answering, "I was just over there talking with my friends, and I just got this feeling that you were looking at me..", she blushes before continuing.. "Normally I would have ignored you, but for some reason, and im not really sure why, I thought you might like a better view.. So I went over and leaned in my car to pretend to look for something." The smile vanishes and she looks confused for a second, "Don't think thats going to be happening again, I have no idea why idea why I did that.. Anyway, you are nice enough but no offense, you aren't really my type.. Now is that all, I need to get back to class?"