Haven't updated due to being busy, and needing to get over the shock...
My sister and I did some running around in the morning of the 18th (including getting some yogurt and Tums). We came back at about 12:40pm. I heard a fluttering of wings in the kennel while I was walking toward it to check on Quiet Hen. I ran the rest of the way and opened the kennel, and saw that she was convulsing or having a seizure, or something of that sort. I gently picked her up, calling her name in the faint hope that she might snap out of it. It seemed that she was already unconscious.
Then she went limp, I felt one more beat of her heart, and then she exhaled for the last time. She died in my arms.
I had a "Partylite" party to go to with my sister that evening in a city a couple hour's drive away, so she helped me wrap her up and put her safely in the large freezer so that we could perform a necropsy later without worrying about any sort of decomposition while we were gone. Then I called my mom at work, told her what happened, we comforted each other, and then I had to go. We were out the door shortly after 1pm.
When we came home from the party after midnight, we performed a necropsy to the best of our ability after making sure that her body was not frozen (was wrapped in a garbage bag and towel). Lack of complete knowledge of organs in a chicken made it a bit of a challenge, but here's what we've learned... (organs not mentioned were inaccessible with the tools we had or not recognized.)
- Appeared severely underweight with no excess fat
- Cause of death was heart attack - confirmed by blood pool in front of heart and excess blood in/around heart; there was no fat around heart
- There were no eggs in her abdomen - no yellow balls of yolk indicating an ovary from what we could find
- Her gizzard was overstuffed with undigested grass, and about half the content was rounded pebbles; sister noted gizzard content was not very moist, more paste-like
- Small intestines seemed empty (did not investigate the inside)
- Large intestines seemed squishy and inflamed (did not investigate the inside)
- Liver was a deep blood red, looked very healthy
- Crop was filled with the food I had last fed her (sister accidentally ripped it open)
- Oviduct seemed normal, maybe inflamed (did not recognize it until after the necropsy; did not investigate the inside)
- There were three round bulgy things around the intestines that looked mostly white-coloured with some gray (did not investigate the insides)
- There was a large mass of fat gathered at the front of the intestines, felt solid
- Only stink came from digestive system (but not gizzard)
- No signs of worms
With all that information, I think it may have been impaction, but I can't be sure.
Pictures have been taken of some of the necropsy, but I'm not sure whether to post it in this thread and edit the title to warn of graphic photos, or start a new thread with a warning title. There's also the matter of where to upload... (because it's pretty graphic.)
Thank you everyone for your help and support.