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Probably just a teaspoon to a tablespoon to start with, maybe diluted a little, especially if it is a particularly strong/concentrated brand. Maybe see what some credible websites like British hen welfare trust or chicken vet recommend? After that just add a little to her water.

Sounds to me like she has had both sour crop and impacted crop as one can tend to cause the other. For example impacted crop is when the food in the crop cannot empty as it is blocked, which can then resolve itself, but the food having remained in the crop for so long can start to ferment...