Sounds like a sour crop. yes, I would assist her in "throwing up", I would put her in a cage if you have one and withhold food for 24 hours. I would put organic ACV in her water (a tablespoon per gallon) and make sure she drinks that. If she isn't, you may have to tube some in her. I solved a sour crop issue with a hen of mine using organic ACV in her water (making sure she got some in her every day by tubing) and giving her an oregano oil capsule every day for three days. I bought my oregano oil capsules at health food store.
So, try to empty crop, withhold food overnight, tube ACV water in her daily if she won't drink it and one oregano oil capsule (open beak and push to back of throat) daily for three days. By day two she was interested in food again. Don't give sugary foods during this treatment. I continued acv water for a couple of more days after improvement and she was fine. So, this method worked for me.
So, try to empty crop, withhold food overnight, tube ACV water in her daily if she won't drink it and one oregano oil capsule (open beak and push to back of throat) daily for three days. By day two she was interested in food again. Don't give sugary foods during this treatment. I continued acv water for a couple of more days after improvement and she was fine. So, this method worked for me.