We have a Mille Fleur hen who is very big and fat. Last year she started limping and it became progressively worse. We confined her in a small pen for a while and she got better; then she got mixed up in a fight between other hens about two months ago, and she got knocked down and started limping again. This time she is not getting better; we have been letting her out a few hours each day hoping the leg might just be stiff and weak and that it would improve with a little excercise. Problem seems to be in her hip really more than her leg, but we're not sure; maybe a torn ligament? She seems cheerful and healthy otherwise, and is eating well, as always. What can we do?