My DS has about 50 chickens. I just was in the coop and one of them is kind of dragging a wing and limping. I picked it up and flipped it over and both legs move well when extended and recoiled. Opened the wing and couldn't see any damage but I'm far from an expert. She's eating and drinking and getting around. Should I isolate her to prevent further damage. She's one of the chickens that roost in the rafters and sometimes they really fly to get up there! I'm thinking she must have missed on the way up and hit something. I've seen that happen before.