Millie

Millie is still happy to go for a (very slow) walk, she's still wagging her tail and sniffing the air, but you can see how thin she's got. She dropped from 30 kg to 20 kg and has a very bony little bottom.
She had a little cooked chicken for breakfast, but she's not supposed to eat protein as her kidneys are so bad. I just don't know what else to do. Is it worse to give her something which is damaging her kidneys even more, or watch her starve to death as she only wants to eat protein?