The vet lab at UC Davis should be able to do a necropsy and find out what happened to her, I have friends who take their goats up to Davis for vet checks.
I'm sorry for your loss. This is the part of chicken keeping that I'm not looking forward to.
Hello from San Lorenzo.
I'm new to chickens, we don't have any birds yet but hope to learn from this forum and use it to help us decide what breeds to raise.