I would separate if I couldn’t give medications or foods easily, or if she is being picked on or kept from food. But after having a sick hen recently who was kept in the coop in a basket nest box on the floor, I have seen her flock attack her after her recovery. Once she became alble to walk, I...
There may be something environmental that is affecting her, but not the other chickens. Since this has been going on for several weeks, I don’t see a reason to separate her. Do you notice dust in the coop or dusty feed, poor air circulation, mold, or something in the bedding that might be...