Did you give charcoal, if so, how much and how often?
Does she have access to oyster shells?
Does her abdomen look/feel abnormally swollen?
Niacin is always a great thing to try, but maybe also add some nutridrench to her water since shes off her food.
You mention somewhere along the thread I think, that you're worried about one of her legs?
Have you felt her leg/checked for heat, swelling? I recently had one of my girls hurt her leg, and I didnt notice any heat or swelling but the vet confirmed it was a sprain. I gave her aspirin and that helped her regain her appetite.
You can try an aspirin- a 75mg dose for a larger breed, 45mg for a medium sized breed.
You can put the tablet into half a grape, blueberry, or hidden in a tablespoon of wet oats, or egg, whatever she will take.
Your vet should be able to prescribe some pain medication for her. My vet gave us a simple pain meds and anti inflammatory that is usually given to dogs. It worked much better than aspirin.