What I know is that I have a black hen that has outlived others from two hawks and a fox (I was 10 feet away from the second hawk attack). Because of issues with hawks, I no longer free range.
There are some things you can fix, some things you can't. If she is egg bound, a relatively easy fix. I had something similar happen to one of my chickens. I thought she was egg bound. I took her to the vet. She had an enlarged gizzard that was basically suffocating her. I'm so sorry about...