Last Wednesday I noticed my buff orphington wasn't herself. Her back was bent over, her tail feathers tucked down between her legs, not eating or drinking. Thursday I took her away from the others. I was told by some other chicken people she had coccidiosis so I have been treating her since Friday with corid. I mixed it into her water and have given her a straight dose daily. On Friday night a vet told me to treat her for worms with wazine. So I have treated both her and my other 5 hens.
She still isn't eating drinking and on Saturday morning started doing this strange neck movement. She can't hold her neck up and constantly pulls it back up and it falls back over. Please see pictures and video. What does she have?