That's the freaky part - she was fine that morning, no predators got into the coop, no freeze etc. Wouldn't know about the egg bound... I suppose it's a possibility but don't know much about how that happens. Her neck was really floppy when I found her and I thought maybe if she got spooked and flew into the pole that they roost on and broke her neck? Seems unlikely, but it's all I could come up with. This same thing happened one other time about a year and a half ago, only it was a rooster then. No roosters now at all in the picture.
Thanks for thinking about it.