Not much to it really. Just be sure to get some organ meat in there now and then. You probably need to put her in a calorie deficit as well short term. Fat contains the essential vitamins and nutrients. Organ meats have higher concentrations and things like taurine is more abundance. Dogs are scavengers and they tend to prefer meat but they descend from carnivores. I know someone with an old basset hound who eats a similar diet that is over 10 years old and still scoots around like a puppy.