the craw area is so enlarged it swings back and forth when she walks. She acts happy and healthy, eats and moves with the rest of the flock.
Is is soft and feels like a bag of grain.
I would check the crop again early tomorrow morning, maybe just before sunup so the hen has not started to eat yet.
The normal, healthy pattern is for a chicken to wake up with an empty crop, then have a partly-full crop during most of the day, then stuff the crop entirely full in the evening before going to sleep. By morning, all that food is digested and the crop is empty again.
You've already found that something is in the crop during the day, so that's part of the normal pattern. If it is empty in the morning, that is another part of the normal pattern.
A crop that is full and hard, and does not empty, is a problem.
A crop that does not empty is a problem, even if it is not completely full or hard.
If the chicken does not act healthy, that indicates a problem too (maybe a crop problem, maybe something else.)
But if the chicken acts fine, and the crop seems to be filling and emptying properly, I don't think you need to worry or do anything about the situation.