Yeah FreshPrince is pretty much right. Seperating it into 2 dates (one to build comfort and the other to seal the deal) is usually a waste of time, but if shes not comfortable to meet up for a one on one, then this method of 2 dates would definitely work.
A good way to go from txting to talking on the phone is to text her something like this:
YOU: OMG, something just reminded me of you. Its a kind of awkward situation, but its funny

HER:what is it!!??!
YOU:Hold on, too much to text, ill call you in a little bit
(then call her a few hours later. She'll usually be dying to hear what it is that reminded you of her)
And then when you get her on the phone (I know this is kind of skeezy, but whatever, it works) I usually just make up a stupid funny story, or Ill tell a real story and say that of the people in the story had her name or was a soccer player just like she is or whatever and thats y it reminded me of her....
But listen, the problem isn't that you didn't create enough attraction in the initial interaction. Attraction isn't what makes girls want to see you again. The problem is that you didn't create enough investment. The best way that this is done is through qualification. You gotta find out things about her that you like and tell her that you like because of those things. I suggest you do this while you're on the phone with her.