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Thank you for waiting. From what you have described, it does sound like Gracie is suffering from a crop problem. When the crop becomes full and impacted and it isn't quickly remedied, fungus grows in it, causing sour crop. If not treated quickly, it is often fatal. The best option is to see a vet for a ceratin diagnosis and some Nystatin or another effective medication. There are supportive treatments you can do at home, but on their own, they're not likely to result in a cure. You can massage the crop a time or two a day. Hold Gracie with her head down so she doesn't aspirate the liquid that may come up. Of all the home measures, massage is most likely to help. Sometimes it helps to withhold all food for 24 hours, but provide plenty of water. Some chicken keepers report that feeding yogurt helps, but you have already tried this with no results. Others like to put apple cider vinegar in the water. As for antibiotics, they might help if a bacterial illness is responsible. Crop problems are more likely to be caused by a fungal infection. I don't have a lot of faith in these home methods, and prefer to see a vet right away.
If you have more questions, just let me know. I hope that whatever you decide to do, Gracie will be able to recover.
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