I need some experienced advice. One of my black copper marans hens that I've had separated and waiting for eggs to be infertile so I can breed is suddenly having problems. She was fine yesterday but today, when checking for eggs, she was laying on her side in the nest, breathing raspy and heavy. I picked her up and brought her in immediately. She was weak, keeps falling asleep, and spit up some clear fluid a couple times. At first, she seemed to not be able to even hold her head up. Hubby and I gave her a 1/2 cc of penicillin. Now, she's wrapped in a towl on my lap. She keeps dropping in and out of sleep but she's holding her head up on her own right now, her breathing seems almost back to normal. She seems a bit pale on her face but her comb looks fairly normal (it looked slightly blue tinged when I first found her like that). Any clues what this could be? Is penicillin a good choice of treatment? I'm not entirely sure what I'm doing. This is a new one for me.