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Then yes, it is probably sour crop.

For example, if it is hard, it may be impacted crop and not sour crop. How the crop feels will help determine what crop issue is going on.

Ok. Feel her crop- what does it feel like?

What does her crop feel like? Is it squishy, doughy, hard? Feel one of your healthy birds to figure out what a full crop feels like, so you can compare it to that. Is she eating? Drinking? What does her poop look like? I'm not very well versed in crop issues, but that base information would be...