I live in CA, San Jose. My flock is fine healthy to the core. I go down to let them run for 1 hour. Starting immediately on Friday I noticed one of my hens standing still and is inactive. She would Just stand there barely barely grazing. She ate and drank just suddenly lost activity. She just stood there in one spot starring out into space. She was all bunched up like it was cold. Seemed sleepy entire time. On Saturday she did the same thing. I came back 6 hours later she was dead on her back. They are all molting right now. No we don't have mites. I checked her butt and it looked messed up. One of the area around her hole was swollen red. It wasn't an even pinkish surrounding. Could this be problem? All my hens are 6-8 month old got them this summer. Hen that died had blue pale tint on comb when i found her dead. Nostrils had some kind of watery clear mucus. Just a little bit of it. What killed my hen?