You should make more of an effort to contact her yourself. I understand it's expensive, but maybe you could try an alternative like skype? Free live video chat is also a little more personal than just a phone call.
And this is just a theory, but it's possible that she is pulling away if she thinks you aren't as interested in her as she is in you. And that could be because she's doing the majority of initiating the calls. But I find it funny that when you put forth the effort she slams you for it...hmmm...tricky situation. But since I'm just sitting here through a computer and can't diagnose this properly, let's try a simple treatment - more communication. Ask her to do a skype date and see how things go. Or even set up a time for a phone date. Then you initiate the call so she sees you're putting forth the effort for it.
Based on what you've been telling me I'm not sure that's it, but just to make sure things aren't being lost in communication you should give this a shot. If nothing else you'll get to see your beloved on screen for awhile.