Awww... I'm sorry. It hurts when we're waiting for our Ts to call back, we expect them to call back, we trust them to call back... then silence. Yuck.

Is it possible that something happened? That she really DOES care, but didn't call for some other reason? For example... maybe she had an emergency, or a problem with her phone? Maybe she was trying to clear up her schedule, move some things around, and didn't want to call you back until she had succeeded doing that?

I'd give her the benefit of the doubt, for now. In the past, I've assumed people don't care based on things they did (or didn't do) - and gotten angry and hurt, then found out later there was a good reason for what happened. Then, I end up feeling like an idiot. So, I'd try to hang in there and not quit yet, and be open to the possibility that there's a good reason. Then when you DO talk to her, you can check that out... just ask, "Hey T, you said you'd call me back, but I didn't hear from you. What happened?"

You can always be mad and quit later, if it turns out she did totally flake on you!

Good luck, I hope you hear back from her soon!