Went down to open the pop door at 6:15am for the girls. The sun was just starting to come up and that is my normal time to open up. Usually within two minutes of me opening the pop door the girls come out one by one to get there breakfast and water. When I opened the pop door I heard a strange noise inside the coop. I stepped backed and 5 of the girls came out into the run. I was waiting for the 6th girl who is always last. I didn't see her at the pop door so I ran around to coop main door to check on her. As I open the coop door there she was laying on the floor of the coop on her side, feet curled ridged, and just looking like she fell out of space in a crumpled mess. She was alert and lifted her head. I ran inside and got my two kids, a laundry basket filled with hay. My son picked her up and placed her in the basket and we brought her inside. She nestled right into the hay as we caressed her and checked her over from head to toe. It took her about a half an hour to really come around and start eating out of our hands. We checked all the skin under and around her wings and all looked nice and white. Her vent area is nice and clean and pink. Her feet and head where nice and warm and eyes nice and clear. (She is a black Cochin/RIR hen, she is all solid black and has a few feathers on her feet) One of her wings is nice and tight next to her and the other is very droopy and touching the floor when she stands up. She absolutely loved the fact that we brought her inside and gave her a ton of love and affection. She is a very docile girl, slow mover, hates to fly, She was born in June. Best we can figure out is she was the last one on the end of the roost bar last night and when the girls woke up this morning they pushed her off the roost while she was still sleeping and hit the floor of the coop. The roost is only about 16 inches off the floor of the coop. After having her in the house with us for two hours she was standing on her own and moving around but still had the droopy wing. We brought her outside to the run and placed her in with the other girls. She immediately waddled over to the food and started eating and scratching. The other girls haven't bothered with her. We did move her wings and all seems fine, nothing looks broken and she didn't act as if in pain when we opened her wings. Is it possible that she may have sprained her wing? Am I over looking something. Should I keep her separated from the other chickens?