Yeah, so she's not as into you as you are into her. Chances are she already has someone else in mind she's interested in seeing, but is trying to be nice about it.
At 1200 miles away I'd suggest that you consider finding a real girl to have a real relationship with. Unless you have the finances to support that kind of a relationship, it just won't work.
My wife and I dated for about 7 months before moving in together. Long distance. By long distance I mean that I was in Phoenix, AZ and she was in San Jose, CA. One of us would fly to see the other person ~ every 2 weeks on weekends.
That's a good amount of money to be spending on flights to maintain a relationship, but we could afford to do so.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."