So far Bernie’s crop empties fine overnight and she fills it up to that level at least three times a day to my observation.Some birds do have these pendulous crops. Sometimes it's a health issue and the crop doesn't drain properly because the crop exit is higher than the bottom of the pendulous crop. Some people use crop bras to resolve such problems.
I am not sure she fills up so much when she is confined with only commercial feed available. It seems to be when she forages that she takes in a higher volume.
What astonishes me is that if I happen to stop by with some chopped nuts or blueberries she is still more than capable of cramming them in!