Often times a dog won't eat because the kidney disease makes them nauseous. Mirtazapine is a great medication to help stimulate their appetite. You must do whatever you can to keep your girl eating. If she stops eating, she will go downhill fast. I cooked for my little one, when she refused to eat the canned prescription food. There is a k-9 kidney group forum that might help as you navigate through these trying days. Best wishes!
K9KidneyDiet : K9KidneyDiet