About three days ago I went out to my chicken coop and noticed that my Barred Rock pullet was laying on the ground and had been pecked rather severely of her feathers on top of her head. I recently introduced this pullet along with two others to the rest of my hens and they really seemed to be integrating well for about two weeks. After finding the injured pullet, I separated her from the rest of the chickens and put her in a crate inside my home. It has been raining a lot recently so I didn't want her to get wet. Since finding her in the coop, she has not once been able to stand up. Her legs are completely limp and she can barely move. It almost seems like she might be paralyzed but when I pick her up she can kind of hold her neck up. She cannot eat or drink on her own, and when I try to help her I have to force it down her throat. At times she seems alert and will scream a little when I pick her up a certain way, but otherwise she mostly sleeps and she feels pitifully thin and weak when I hold her. I am perplexed as to what could be the issue. It crossed my mind that maybe she was already ill and was attacked while weak. I have a medication to prevent/treat coccidiosis, so I mixed some in with her water and have been trying to feed her mashed banana with a bit of coconut oil but I have not noticed any improvement. None of my other chickens seem ill. This is so sad to watch and I'd like to take her to the vet but cannot afford it at this time. Can anyone provide insight as to what might be the problem? I don't want her to suffer and it seems like she won't improve.