I looked up gout and there are two types. One says it is possibly due to a genetic defect but that if due to excess protein, that would be 30-40% protein, OR it meant 30-40% extra protein over what is required. The way it was written, I'd say it meant 30-40% total protein. Also, can be excess calcium and a few other causes that I'm not sure would fit. The symptoms would fit, though, for the most part. Sudden death or depression, weight loss, darkened head and shanks (I'll have to look at her again on that one), cessation of laying, attempting to hide, white pasty diarrhea (she doesn't have that one, that I've seen when de-pooping).
The other type of gout is so vague and general and with either one, there's nothing to do except change the diet, if it's actually diet related. Both say they can be from genetic predisposition. If its gout and she's genetically predisposed to it, maybe the molt sent her over the edge. Wish I knew. I just hope I dont lose my Velvet, my silly blue diva.