I have a 3 yr old hen that all of sudden couldn't walk anymore. Her feet are curled up and legs appear useless.... She uses her beak to try to shift positions. During the first week, she was very lethargic and refused food and water. Would sit real low with wings spread out. Then one day, it was like she "woke up" and started eating and drinking, but her feet and legs are the same. Any suggestions?