2 year old gray hen if course my favorite. Lays eggs bigger than the duck.i could easily see her skin very red so i treated all for mites cleaned coop. She looked a little better for a few weeks . I have treated her twice since Now last night she is sleeping kn the ground alone. Her vent looks like sticking out and black i sprinkle her. Today she is just sitting put her under warm infra red light She looks bad. Is it possible that only 1 chicken could have mites so bad. There is dirt for them to bath but it has been so wet. I dont want to lose her eyes look greenish. I have 4 8 year old hens. And 3 2 year old grays. How can i worm her? Might-be too late.