A vet could do a necropsy to find out what actually caused her death but it sounds like she was in a bad way, I doubt there was much that could have been done to save her. She sounds like a very unique and special goose. She was fortunate that you could be there with her at the end.
I'm so sorry Bernie. I'm not sure from your post if your goose is a domesticated breed or a wild Canadian goose but 8 years is a pretty long time for a goose to live, longer for wild geese. Due to the suddenness I'm thinking there was some stress or trauma which is harder for a mature goose to...
Too many drakes in a duck flock will result in the females having stripped heads but I haven't seen it with geese. My recommendation is to split them up for her safety as he could injure her jumping on top of her. I've lost geese because the flock was too aggressive and jumped on one causing...