Sour crop will be enlarged and when you feel the crop, it will feel like a water filled balloon. They also become less active and tend to puff out...generally, they don't look well either but feel the crop. If if is big and feels like a water filled balloon it is sour crop and if it is large and very hard feeling, it is more likely impacted crop.
Every night i go to lock the coop up her crop is very large and hard but then its normal the next day......is this normal? her crop is kinda squishy and small right now, i tried smelling her breath and it smells normal.