Given her overall body condition, I don't think this is something that just happened in a day. But, my guess is that it is reproductively related, and the supersized egg surely didn't help. Maybe that's just a stereotype about Golden Comets, but I didn't realize how hard their laying cycle was on them until well after I already had a couple of chicks of that breed. Just tucked them all into the coop tonight, Goldie included, so we'll have to wait and see what tomorrow brings. Thanks everyone for your thoughts and advice, I do appreciate it.