For those interested, my hen is still alive.
She has been inside for 7 days now.
Today she is eating and drinking again, a sort of chicken roller coaster (one day looks like she is going to die, then perks up).
I don't thinks it's coccidiosis, Marek's, or sour crop.
She does not have any paralysis. My husband thinks it's dehydration.
I have know idea.
I have given her antibiotics, electrolytes (separate from antibiotic), probiotic, a bath (x2), heat, offered different kinds of foods, a little grit, added a little DE to her crumble for deworming, checked her over for lice and mites (negative).
She is honestly doing the best with electrolytes, bread, and applesauce. Today she looked okay, though still weak. She was standing. Diarrhea seems to be resolved. She has poo balls now, which is a tremendous improvement. Her crop feel fine, not soft or hard. Empty, since she is eating just a little, but empty by morning.
I took her out for some fresh air before the cold weather hit again.
All my other hens are still fine.
Edited by freedom chick - 2/8/16 at 8:25pm