I imagine that you asked, Polar, in hope that the reason would be something that you could either apologise for or put right in some other way. I think that many of us (if we were brave enough, which I'm not sure i would have been) would have asked the same question, as there could have been no other way to get your friendship back on track.
Given her reasons, I'm not surprised that you are upset. On the face of it, your so-called friend's reasons sound quite ridiculous, and I am not surprised that you no longer feel you can be friends with her.