Wow. That sounds so much like situation. Except reverse. I feel like the teenage girl chasing a boy who doesn't like me. I think I put reacted too much this past month and it has scared him off.
Anyhoo... I would only respond to her nice text. But some tiny advice, maybe every now and again don't respond. There really is no harm in it. You can say you fell asleep or whatever. Try not to fib though. It will be pulling back some. She will notice, I promise you. It almost sounds like you are too available. Whatever you do, when she reaches out again, act calm and friendly. Kinda like a "my bad - so what's up?"