Nope, you didn't do anything wrong. The crop is essentially a food pouch, when she eats the crop fills up, the food then goes to the gizzard to be processed, then it's digested, she poos, then it's starts all over again. You will see the crop at various stages of fill throughout the day. A chicken should fill it's crop before bed, this food will last them all night. the crop will be empty or flat in the morning, then she will refill again.