You may want to thaw her body in a cooler on ice, since they usually want the body kept cold not frozen. $50 is a good price for necropsy and any information about any contagious diseases. Some states are much more expensive. If you decide to get one done, let us know what the final findings are here on your original post. If you decide to bury her instead, I understand. I would keep an eye on your flock and any other lower pecking order chickens for any bullying.
