Yes. Have you ever dewormed her or the flock? She needs to be in a warm place, preferably something like a rabbit cage or a dog or cat crate or carrier with shavings or towels and a heater panel or warm room, or a small pen with shavings or sawdust, where she can be warm and have some privacy but still can hear and see her friends. They do need to be warm. Get someone to help you and have one person hold her while the other one can gently pry her beak open so you can look in her mouth and down her throat with a flashlight. Look for whitish or yellow lesions in her mouth and throat. If she has bad breath that's another clue. Check her crop to see if it is empty or full, I would assume it's probably empty, but possibly not. Check her ears to see if you see any crusty matter or anything unusual. Does she have diarrhea or any kind of discharge?
She could have: Worms, ear infection, Canker, crop issues, lice or mites, or a respiratory infection, (to name a few things) for starters. Once she is showing symptoms like you describe, she is very ill and requires emergency care on your part. Don't delay. Chickens hide symptoms until they are very ill. Once you have her settled in a hospital pen, give her some time and then see if you can coax her to eat or drink. Applesauce is tempting for sick chickens, I mix it with their crumbles But anything they will eat, especially stuff like bread crumbs soaked in buttermilk or water, minced frui or tomato, chopped grapes (another favorite), oatmeal, yogurt, scrambled egg.
If you can get a fecal sample from her, see if your vet will do a fecal float for you, which will help you narrow down whether or not if could be worms or coccidiosis. It's not an expensive test. If you can't do that, write back with what you see after examining her.
If she won't eat, you can try carefully sipnoning in some water or apple juice, or apple sauce, into the side of her beak being very careful. You can also tube feed them, but I prefer not to do this, as I feel it is stressful for the bird. Still, sometimes it is necessary. See if she will eat on her own first. But she won't when she's out with the flock, she's cold and stressed and sick.
Keep us posted!
I am so sorry about your hen. It doesn’t sound like there’s much you can do, but maybe move her to a warm place so she can be comfortable in her last few hours.
