My apologies for the delayed reply!
She has recovered really well!!! They performed a "flush" of some kind, similar to what JenellYB mentioned above. She has been on an antibiotic and a digestive movement liquid, all of which seem to be helping. Sadly, I just put her back in with the flock yesterday, and she is eating gravel/sand again!!! Hopefully in normal amounts....
I am giving her the medications (including calcium supplement) via yogurt, hoping to help her insides heal and keep everything moving through her. Funniest thing about this story, is she began laying eggs during all of this. First egg came out right on the exam table at the vet!!! It is very obvious that she was craving minerals, which I am providing with layer feed and oyster shell. I think it will take awhile for her to feel "balanced" before she stops this weird behavior.
I also learned from the chicken-Doc that this behavior is very common in all bird species. They often become impacted from overeating minerals........Not fun!!!
Danielle