T.F.
I don't see how this could be related to something you did or are feeding her. Don't kick yourself over it, it sounds like you have some work ahead of you, research, doctors, etc...to get to the bottom of this. Sometimes to find what is causing a symptom takes a long time. Stay with it until you have answers. A good question is to find out if it's related to something genetic, it may or may not be or may be so rare. Until you have some answers it is hard to say. All the best!