I have a 7 month old Barred Rock pullet who may have cage fatigue (my pullets are confined in the winter). I see no signs of injury (no wounds or obvious swelling), but she can barely support her weight on her right leg and spends most of her time laying down. I have separated her from the other chickens and have started feeding her Vitamin D and oyster shells with her food. She seems to be eating and drinking normally and I have put her food and water where she can easily reach them while she is laying down. Is there anything else I should be doing? Anyone know if she will recover or will I have to cull her?