Our healthiest hen, 2 year old Rhode Island Red, died today. I found her dead next to our house and her favorite bush. There was no sign of a struggle, nothing to indicate that she was attacked. We live in the willamette valley in Oregon. It wasn't that hot, 80 maybe but there's shade and water, she'd been through much hotter weather. In our yard there are rose bushes and blackberry bushes and mint. I have no idea what caused our strongest hen and best layer to just die. We have one other Rhode Island Red and two Barred Rocks. Any ideas on what happened would be greatly appreciated. I want to prevent it from happening to our other birds. Thank you.