I went into my pen today to discover one of my young hens laying in the corner with her eyes closed. It was obvious she was breathing, but barley alive. She was a few months old, and hadn't started laying yet. I gave her a light tap to see if she would open her eyes,which she did.. I tried feeding her, but she wouldn't eat. From there I carried her inside, and things got worse. She tried to get away a couple of times, and then her head started to sag. She couldn't hold it up anymore.. I'm not sure what brought this on.. She was fine yesterday, and suddenly sick today. Any thoughts on this would be appreciated!