I was walking into the coop to do the nightly check. When I got there I found that the chickens had knocked over their waterer and flooded (it was all muddy) the floor of the coop. I noticed our almost 2 year old Cochin hen sitting in a really muddy spot. I gently nudged her with my foot to get her out of the way, but she didn't move. I examined her and found out that her butt was really swollen and her legs weren't moving. I brought her inside to separate her and soak her butt and legs. I got all the muddy poo off of her and put her in a small cage with easy access to food and water. There is also a heat lamp on her. Any help at all is appreciated, thank you.