I dunno what the other guys are going to tell you, cause you could probably salvage this, but I dont know anything about txt game, or even much about phone game.
I think you shot yourself in the foot from the beginning. "how pathetically bad I did" is setting your self up for failure right there. If she doesn't call back, then SHE did pathetically bad, and thank god you got rid of another girl who is hot but is a Flake, that's one bad apple out of the bin, ya know?
If you can fix this, great, you learned some new stuff, if not, great, now you aren't wasting your time on a flake and you can go grab another hot 10 and see if she earns your respect.