don't facebook chat with her, don't text her, and don't call her on the phone.
you need to become a better communicator and by doing so you'll realize how shitty modern technology is for communicating. sure it is great for stupid small things like, "i'll be over at 7" or "homework was on page 9", it is however incredibly shitty for anything beyond that. Text carries with it no facial expression or hand gestures, no delivery or pacing, and no tone or emotion. Text is lifeless and dead. if you really want to be sincere talk to this girl face to face, don't waste your time on text based communication. You'll be far more genuine, far more intriguing, and far more successful not just with her, but with everyone.
and remember, good luck, we're all counting on you.