Got a black austrolorp hen with swollen spots on her legs and feet. She's losing weight and her comb is receding. Reluctant to walk around and secludes herself from the other 4 hens and rooster. Just got off a cold snap (single digits) but seemed to fare fine with the others- left in coop that didn't get much below 20 on the coldest days. Doesn't seem to be bumblefoot- no sores and in a few different places. Ravenous when you put a hand of feed in front of her, but won't go the the feeder. Spends 24/7 roosting under cover outside the coop last few days. Any suspected ailment/treatments appreciated.