I noticed my 7 month old chicken nesting in the hay on the coop floor. When I approached her she did not try to run away. I thought maybe she was laying an egg. The next time I went in to check her she was in a different spot but still on the floor and not walking. She is alert and eats well. She drinks the water with electrolytes. Her feet do not have any visible infection. They do however look atrophied and won't splay out. She can't seem to put weight on them. When trying to stand, she falls toward her face and puts her wings out. I put her on her back and felt and stretched her legs. No swelling or apparent injury. What could it be?