I went to check on my newest flock there about 20 weeks old & one girl was laying in the corner. I picked her up she felt light & she threw up just water. She is puffed up & real lethargic. I now have her isolated in a cage in my shed it has A/C which is on 79 degrees window open. The chickens were raised in this coop since they hatched . I gave her some vitamins in her water & some boiled egg but she's not interested. Her crop is empty. She was on the roost last night & free ranged about 4 hours yesterday before bedtime. I can't figure out her problem so I don't know what to do ? Any thoughts are suggestions. There's 18 chickens in the coop. The coop is below its big. Some of the girls have started to lay so I've been giving them lay pellets for about two weeks. I have two other flocks that range with them but don't really hang out together. Seems like everytime I pick her up she throws up water.