So sorry that you lost her. I would try to get a necropsy through your state vet on Monday. That would be the best way to find out what was wrong with her. The body must be kept cold, but not frozen. Here is a list of all state vets to contact:
https://www.metzerfarms.com/poultry-labs.html
https://www.metzerfarms.com/poultry-labs.html
