Just asking and certainly not to dismiss what more experienced have already told you about impacted crop. But, is there any possibility that she over indulged herself in drinking water before this happened? I ask that only because a chicken without access to water for a few hours will excessively drink and, yes, to the point that water will run out especially if picked up. I have seen it a couple of times when I was careless enough to remove a cap off of a gravity fed waterer after filling it up.