They did a autopsy on Joanie immediately, and she died of a blood clot that burst in her liver and bled out into her abdomen. This meant that it was an independent event and as the doctor put it, 'crummy timing.' She called Joanie a time bomb, and said that they blood clot had probably been there since she was in the egg, and it was just a matter of time before it burst. We put all the chickens on a round of antibiotics just to be safe and have a jump on it if any others starting getting sick.
It has been one week today since Missy died, and so far we haven't seen any signs of sickness in the others. I think they have been mourning a little. Chachi seems to call for Joanie, who was his favorite, when he is out digging for worms. It is sad, and our coop feels incomplete now. We had just gotten everybody grown and laying eggs. Joanie was my first hen, and Missy was a sickly little baby her first week, and I had to nurse her in the house for about two weeks before she started doing better. Not that all my chickens aren't special to me, but these two held a unique place in our hearts. Our little family was happy.