I have been dealing with this for about a month now, with my Brahma hen. In the beginning I knew she was sick when I shook a bag of meal worms and the flock came a running, but I was missing one. I found her standing there with her eyes closed, so I picked her up and her crop felt like a water balloon. I vomited her and then brought her to my garage where she could be alone and not picked on. I held water and food for 24 hours. I had to vomited her the next morning and felt her crop and it wasn't empty, there was stuff in it. She started to get better until I stupidly let her start to eat corn and grass/free range WAY TOO SOON. She got sick all over again. So I had to vomit her two more times and I mixed electrolytes and polyViSol in in some yogurt with water and fed that to and only that for 2.5 days. Then I got chick starter and that is all she gets, plus the yogurt. Her water has probiotics and electrolytes in it as well. I used a dropper to give her the plain yogurt 3x a day. If I didn't vomit her, she would have been gone by now. She is slowly recovering, but I am also dealing with mites. Wrap her in a towel and feed her. I hope she gets better!!