I would say don't make them vomit!! I just had a friend of mine on this site tell me she lost her first chicken by thinking she had sour crop and made her vomit. She died in her arms. Speckled hen gave a 4 step plan a couple of post back. I would say follow her plan! Do you have a vet that you could have look at a poop sample or do a swab on her. I made a lot of calls to vet but I did end up finding 2. One is our zoo vet that works on birds and the other one works mostly on dogs and cats and a few chickens. Having a vet to ask questions and sometimes see is very helpful.