dont hang on to it. you sound like you need to talk to her. a lot of times, the t waits for you to make the first move. she may have been waiting to see if you could figure it out alone, and then if not, then you would call back. i dont think it has anything to do with her not understanding you, or caring about you.

I would definatley give her a call. let her know how you are feeling. and go from there. she may not even realize how hurt you are. if you continute to reach out and then pull back, she is going to tread carefully, and go at youe own pace. i think she is waiting for you to set the tone