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If she is gobbling down food, the crop will likely not be "normal sized", it will be big because she has stuffed it. If you think she has a problem, isolate her from the rest of your flock so you can observe and control food intake and poops.
Her crop should be pretty much flat IN THE MORNING, after she has had all night for her "stash" to go down her gullet and digest. If it's huge in the afternoon, that's not necessarily a problem of any sort. It's when it STAYS huge that indicates you may have a problem - if it does not go down overnight to nearly flat, you could have something in there causing an impaction and food won't go down, or you could have rotting food in there causing a fungal or bacterial infection, and also causing the crop to "sit still", not wanting to pass stuff down. Fungal infections cause bubbles/swelling, so if your chicken is gassy, that might be your problem.
But if it's just "big" and it goes down overnight, you don't have a problem. Some chickens are just pigs and stuff themselves, causing the crop to be HUGE after eating. But if it goes down by itself, you are OK. Make sense?