I did some research on all foods when I was about to get Otis and one of the ones I looked at was Candidae, and there are a lot of bad reviews out there regarding the effect the change in formula has had on their dogs. For a food that is that expensive, there should be no problems, except maybe the few that has food issues regardless of what food they try, there is always going to be a few of those poor pups.
Either way, I choose to give/make mine their food, so they are on raw, grainless food with occasional, very occasional treat (because of Obedience training and all, don't want raw chicken or the like in my pocket…thank you very much). Sorry to hear about her obvious problem.