I would advise you to cool things off a bit, give her space and time, get into doing other things to take the pressure off, but stay in touch..
If/When she is ready she will make the moves, stop chasing so much and see what happens, a little break may do you both some good and giuve each time to think!
Perhaps she is just not ready to commit for whatever reason, don't ask so many questions, concentrate on making her feel comfortable and have fun, keep working on just a friendship..
Good Luck!