Ok I meant to post this earlier, but as I was letting all the chickens in from their run, I was startled to find one of my silkies huddled drooling from the mouth. She was crouched down acting as if she was egg bound. I took her into the barn and then tried to see if she had any obstructions in her cloaca. After a few minutes of finding nothing she started to put her right leg back. As I was trying to fix her leg I realized something wasn't right so I put her on the ground. Suddenly she had a violent seizure and then she died. So my question is, what could of caused this?