If you should lose her, most state vets can do a necropsy to look for a cause of death. The body must be kept cold, but not frozen. Here is a list of state vets to contact:
https://www.metzerfarms.com/poultry-labs.html
Sometimes a brief home necropsy to look at and take pictures of the major organs and abdominal contents can also give some clues. Pictures may be posted here.
https://www.metzerfarms.com/poultry-labs.html
Sometimes a brief home necropsy to look at and take pictures of the major organs and abdominal contents can also give some clues. Pictures may be posted here.