It sounds like you're doing what you should to help the egg situation. Hopefully things turn around for you! Keep searching the forums and you might stumble on someone else who had this problem.
It sounds like she needs more calcium and/or vitamin D. Of course, there are other illnessees that can cause problems with eggs. Since she seems healthy otherwise, I'd give her time to build up some calcium and see what happens. Are you feeding her a layer mix that includes calcium? A high...