Most Helpful Guy
I agree with Brando, text her when you have something to say. Don't feel obligated to contact her just so that you can say you did, it'll feel forced. Likewise you shouldn't feel the need to wait a predetermined amount of time. Don't follow rules laid down by someone else.
Unless you "got her number" by Google stalking her then she gave it to you. She's sufficiently interested in you. Don't pretend to be someone else, or you might just screw it up. Unless of course you were pretending to be someone else when she gave it to you, in which chase you're screwed anyway. ;)
Be yourself. Text her when YOU feel like it. Better yet, call her. Or text to be sure she's available and then call her. Consider asking if she'd like to go out with you after class is over.0THIS IS NOT RELEVANT ANYMORE