Is it cruel to just cull her? And would she be safe to eat?? We don't have the funds for vet treatment especially if its not going to cure the problems.
Actually, I don't think that is cruel at all. Many people on BYC have pets, and do not ever kill their chickens for meat. Chickens are not only pets, but livestock to many people. She sounds like she is failing, and I think ending her suffering at some point would be a kind thing to do. If you want to use her to feed your family, then that would be a final gift from her. It is much kinder than letter her suffer and wither away and maybe have pain.