My ex's grandmother went through a similar time... his mom was home to take care of her (she went to eldercare during the day) and it just grew more and more difficult - leaving burners on the gas stove turned on, that type of thing. Sadly, but fortunately, when she had a stroke, she had to move into a nursing home, which helped alleviate the stress on my MIL. It was extremely tough on her, but I saw the same thing happen to her afterward - their relationship improved up until she didn't recognize anyone anymore. My ex and I were "the nice people who brought children in to see me".
But I'm glad we could make her happy by bringing our daughter, and explaining (repeatedly, but nicely) that they have the same name. That really brightened her up, even when she didn't understand the significance anymore.
Mono. Divorced, two kids (DanceGirl, 13; and PokéGirl, 11), two cats, one house, many projects.
My partner. Poly. In relationships with me, Xena, and Noa.
Poly. In relationships with Chops and Noa, and dating others.
Married, Poly. In relationships with Chops and Xena (individually).
Blog thread: A Mono's Journey Into Poly-Land (or, "Aw hell, there's no road map?!")
Slightly more polished blog with a mono/poly focus: From Baltic to Boardwalk