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Drinking lots of water is often a sign of sour crop.

Well then, at her age it's very unlikely she has a reproductive disorder. Any blood in her droppings?

Check her crop early in the morning before she eats or drinks anything and see if it empties. When was the last time you know she laid an egg? Is her abdomen bloated at all? (the abdomen is located underneath the vent in between the legs) Is she molting?