I'm so glad Pepper is home and her surgery went well. I know you have to get her to eat. When we were facing kidney failure with Tipper (completely different cause to what your Pepper is facing) we were told that the high Creatinine level caused her to not want to eat. As you can get this number to decrease toward normal, she may get her appetite back more. Also, some of her medicines might be making her tummy hurt. You might ask about adding some sort of probiotic to her diet for a while. Good luck. We ended up having the syringe feed Tipper for a while and it wasn't enjoyable for any of us.
More prayers for Pepper as she heals.