[anonymous]

I would go by whatever prescription food that your veterinarian recommends. Continue to work closely with the veterinarian that is treating her. Prescription food, medication and checkups as indicated.
Your only other safe option is to ask your vet for a referral to a veterinary nutritionist.
Or https://secure.balanceit.com Reputable sites will work with your veterinarian.
Beware of homeopathic sites and miracle cures.
Hydration is important, add water to meals and always have fresh water available 24/7