You definitely have to back off. My last relationship turned more into texting and talking than hanging out. Why see you if they can get it all on their cell phone?
I am not saying ignore them, but keep convos minimal and only really if you aint doing anything. If your texts get more, then just call her instead. By texting less, she is going to think you are not caring, or seeing other women. The problem is you set the precedent already, so it might make her think you are just playing games...
Another thing I have found that really works about getting dates... If she doesn't give you a yes, give her some variation of... "If you can't commit to going out, we can get together some other time"... This messes with their head. Women like to be in control and this is you telling them your not playing their stupid games. I have done it 3 times, and all 3 they committed to the date within a couple hours. Basically, you are stating, I am f**king busy and I am not going to tie up one of my free nights with a "maybe".