THIS GIRL had her VS panties sticking out and she made no effort to cover herself up?

There's this girl in one of my psych cles who sits in front of me. She isn't even that young (maybe 22?) She's very cute, and she responds to me well whenever I talk to you. Today when I saw her underwear popped up (she is usually pretty attentive about whether or not her shirt has gone up too high), she made no effort to bring it back down. I even once took my leg and brushed my kneecap off her jeans that were riding a bit low while we were sitting down(she could probably faintly feel it) from behind like it was an accident and she didn't seem to care.