Hi Illegal, I'm kind of questioning why it's such a big deal for her I mean if you've explained, and it's not like an excuse (because it isn't an excuse!!) not to call her.........could she be a bit insecure, or wants a bit more "attention" in some way?? Something to think/talk about??
Still for now lets say she's wanting to help you with it............and the semantical argument, well sometimes you can completely rationalise something, but that isn't necessarily going to make any difference.
But what might stand just a chance of helping you just a bit?? Perhaps if you texted her more/instead of phoning?? Perhaps if you started with her calling you, telling you she's free, and then you calling her straight back?? Perhaps if you agreed on a very specific time to call?? Perhaps if when you call her she agrees that it's just going to be a very quick conversation about..........something very easy, something very specific, something very quick, just to help you feel a little less anxious about calling??? Maybe agree to try to call her every two/three (??) weeks??? Just a few thoughts.
But then again, if it is still a real problem for you then maybe you both could put the conversation about you phoning/not phoning under the category of agree to disagree. Afterall there has to be a lot more to the relationship anyway.

Alison