I have a very lethargic Leg Horn chicken. She waddles, sits all the time, has a red underside, and has no feathers underneath because she drags it. Is she just deformed or is there something tragically wrong with her? My other 3 Rhode Island Reds are doing nicely. I will be getting more to total 12, remodeling the run and enlarging the coop. Any help with plans would be greatly appreciated. It's also been very cold, -25 at times and they have done very well.