Running out of ideas?

Ok so I'm running out of things to text this girl about. When we text we often end up sending 30+ messages each, I would call her but her number is long distance. This girl doesn't text me first and I only text her 2-3 times per week but outside of texting her about her classes I really can't think of much. (she's 19, I'm 18) Also I asked her out Sunday and she said yes but that she's busy until the first weekend of Feb, is she flaking? Any help is greatly appreciated.

what do you text her about her classes? just wondering i'm in a similar situation

When we were in the same class it was how was the mid-term/exam, want to meet up some time to study (and we did), make a joke about the prof that kind of stuff. When I'm not in her class I text her asking how her classes are, her prof, etc. but we mostly just joke around a lot about random stuff.