We've been having some predator problems so for a few weeks I've kept my birds locked up unless supervising outside time. Just started reinforcing the pen and discovered one of my hens is very thin. Her breastbone has zero muscle! This same hen had a significant injury when younger, we nursed her back to health and had her in the house for weeks. Since then she's been fine other than listing 5 birds to a fox in two days, their life us pretty stress free. No new birds, no other changes. I'm bringing her inside and giving chick saver and monitoring her eating. I don't think she's laying yet. What else should I do or loom for? Thanks!