

I'm so sorry to hear about Grapes.
With her age, it could have been a number of things. Bloating, to me sounds like a reproductive disorder, which can lead to heart and organ failure (which I would think could cause seizures) but there's no way to know without an internal exam.
The gash on the back of the head, I can only guess, but I would suspect it most likely was an injury from seizure.
At 9yrs, she had a good life and a loving home, it's good that she was able to be with you and surrounded by your love.