We have four hens, 11 months old. One of them, a Speckled Sussex (Sussie), had what we believed was a crop problem in early December...she was bobbing her head and pulling her neck in, looked very uncomfortable. Crop was not hard or especially distended, but she did have watery diarrhea. We put apple cider vinegar in the waterer, and added yogurt, olive oil and bread to her diet. I massaged her crop periodically, and she continued to eat well and recovered in 4 days. She didn't lay for a while but then began laying normally again. But here we are again with a similar but worse issue. Again she started head bobbing, pulling in her neck and writhing it from side to side. Her crop area looks really big, but is soft, and fits the description of sour/pendulous crop I have read. This has been going on for 6 days now. She again has watery diarrhea. She is continuing to eat quite actively and peck around but no eggs (although I did find a shell-less egg in the yard-maybe hers?). Two days ago I smelled her beak and it definitely seemed sour, so we held her upside down and had her vomit-what came up was a lot of yellow sticky foamy liquid. She still has a very big, soft crop area and we have continued vomiting her, but yesterday and today there is less coming up and the contents are grey and thick. I'm feeding her bread, olive oil, yogurt, and adding a little extra vinegar, but don't know how much is too much. She is with the other chickens and has access to the regular feed. I don't know where to go from here. What do normal crop contents look like? Should I continue to make her vomit if the crop stays enlarged? Or wait and see what happens? How long does it take for the crop to go back to normal? Should we isolate her from food? How do I know if she is getting better? Thanks for your expertize on all things chicken. I have checked the forum many times for information and it is always helpful.