I have a 3 and a half year old Silver Laced Wyandotte that for the past 6 months or so has had feathers that are very wiry and sparse. She was acting fine so we just gave her a protein rich diet and hoped it would work. When her feathers weren't growing back well we chalked it up to it being around molting season and we hoped that she would molt and grow back her beautiful feathers. Sadly that was not the case and up until now she has seemed very alert and healthy so we assumed that nothing was wrong with her and she was just having a bad molting/ bad feathers because of a bad molting. We have also checked for mites fleas or lice and have seen none on her or our other chickens. Also her feet have gained a blackish tint to them in the past month or so. Just today I went into the coop in the morning and she was on the nesting box shelf ( which was weird because she hasn't laid any eggs since the beginning of this) and was just sitting there. She seemed fine and so I left her there and when I went to close the coop up she was in the exact spot just sitting there. I have since then separated her and brought her into the house and put her into a container and given her food and water. She still is eating and when I felt her crop it seemed like a normal chickens would after eating so I have no idea what could possibly be wrong with her. Any suggestions are appreciated and I hope someone can help me figure this out. Below are some pictures of her and her feathers and feet.