That was my reaction too, for what it's worth. My mother left us a few years ago. She had a living will, and while it didn't make the process pleasant, she was able to die in comfort and dignity.
My condolences. Mine died a couple of years ago, screaming on a hospital gurney from the pain of a dissected aortic aneurysm, as I watched helpless to do anything. No Living Will, no instructions of any kind. "Fortunately" for her, she died in surgery and didn't end up chained to a hospital bed or being fed through a tube.
She had a living will, and while it didn't make the process pleasant, she was able to die in comfort and dignity.
You (and your mother) were exceedingly fortunate, sir or madam.