keep in mind that adult cats are normally allergic to milk so go for either soy formula or rice. something that will be gentle on her stomach. if you are looking to change her food go for an indoor formula, they tend to have more greens in them so as to help with her digestive track. look for an all natural one, as it will have less fillers in it, try your local pet store, or call the vet. when in doubt your vet will be the best bet!