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It can get impacted just by her eating something odd, eating too much, eathing too much of something difficult to pass, just plain bad luck. that 'breast looking' lump IS her full crop, you're right. It should be full or at least full-ish when she goes to roost, then it should be down almost...

Yep, they're prey animals, so they can gobble up food when they get the chance, then go hide if they need to and continue to digest and survive.