Could we see a picture of it full and then after it goes down?
It could be normal.... It could be a problem.
Typically, there crop will get full if they stumble accross a treat and wolf down a lot of it. This could be what you are seeing.
However, a malfunctioning crop will not fully empty. So this could be what you are seeing.
Is she losing weight? Weigh her tomorrow and then check her again in a few days. IF she is losing weight, then she has a crop issue.