Sour crop pretty much wipes out the appetite anyway. Ditto drinking. It's why these crop disorders can kill a chicken if left untreated - they starve. The only foods you need to withhold are ones that are starchy or sugary such as scratch grains, bread, cooked rice, etc. They feed the yeast you're trying to starve.
The crop on your chick seems congenitally over-large and she doesn't appear to have chest muscles that hold it in the proper position to drain. That can cause the sour crop as the crop contents don't ever completely empty, fermenting instead.
I would treat the sour crop with twice daily doses of the anti-yeast med. You must do it for the full seven days, even if the crop goes down. Let's hope the droopy crop snaps back to a proper size after the yeast is conquered.
If, after a week of treatment, the crop remains full in the morning before feeding, you will likely want to try rigging up a crop bra.
As she starts to feel better, you can offer her non-starchy food such as boiled egg and yogurt. And giving a probiotic is also a good idea to restore good flora in crop and intestines. Her appetite should get back to normal in just a few days.
The crop on your chick seems congenitally over-large and she doesn't appear to have chest muscles that hold it in the proper position to drain. That can cause the sour crop as the crop contents don't ever completely empty, fermenting instead.
I would treat the sour crop with twice daily doses of the anti-yeast med. You must do it for the full seven days, even if the crop goes down. Let's hope the droopy crop snaps back to a proper size after the yeast is conquered.
If, after a week of treatment, the crop remains full in the morning before feeding, you will likely want to try rigging up a crop bra.
As she starts to feel better, you can offer her non-starchy food such as boiled egg and yogurt. And giving a probiotic is also a good idea to restore good flora in crop and intestines. Her appetite should get back to normal in just a few days.