I have bought a hen recently and she was fine when she came, except for having a bald back from being over-mounted. Then she started to develop a funny walk, like her hips don't support her properly. Her legs look weak and her body isn't held horizontally. Anyone help with ideas as to what sort of problems she might have? She's not got any worse, but she hasn't got any better. I've put her on her own so she doesn't get mounted (her feathers are recovering now).