My 7 month old hen's neck/head is just drooping. She is lethargic and just huddles. Not eating or drinking. She is an egg layer. Her poop is normal. I have 9 other chickens and they are all fine. They all normally free range but were in the coop and run yesterday because we were gone all day and into the early morning. She does seem to be having trouble breathing. Her abdomen does not seem swollen. Her comb seems a little droopy. I have her in a large dog crate with pine shavings, food and water. What can I do for her.