ah, sympathy on your loss. Sounds like she had a good run, especially considering what was wrong. I had a cat with a severe heart murmur and she went out all of a sudden with a heart attack, had been feeling/acting puny for a few hours, it was of course a weekend, and I caged her so she couldn't get out, away, gone, lost. And that was the end. As you say, it was sudden, bang. I hope I go that way myself, or in my sleep. I doubt my cat even felt anything at the time, it was so sudden, like a clap of thunder. She was dead when she hit the floor in her crate. Hugs.