Have you tried any of the 'tricks' to getting her to eat? Have you tried any larger prey? What are the temps in her cage? How high is the humidity? When you pick her up do you notice that she has skin folds, mites, or that she can't grip your hand very well? When you flip her on her back, can she get back onto her belly?
If you could take some pictures of the 'sunken' in area we could probably help a lot more.