One of my chickens has been hunkering down like she's trying to poop or lay an egg ever since this afternoon. She's also been less enthusiastic about food. This evening when I was puting the chickens in the coop, I saw a clear fluid dripping out of her and what looked like some poop sticking out of her cloaca so I tried to clean her up a bit and what came out when I wiped was a soft, deflated egg shell. I will take her to the vet tomorrow morning, but I would appreciate some background on how serious/trivial this is. There was no blood anywhere, a great deal of what I can now identify as egg white around where she was standing, and the egg shell that came out of her looks whole, just ruptured. Thank you for anyhting you can tell me.