I have dealt with Alzheimer’s in maternal grandmother, mother (not a good genetic hand on that side) and FIL. Back then we cared for them in the home until a nursing home was necessary for physical reasons. Our current Town provides a senior "day care" to give caregivers a break, and oodles of senior Services to help one find in home care or other options. If looking at assisted living, potential residents will be evaluated for different levels of care. We waited too long to get into entry level, had to move FIL into Memory Care unit without stopping at go. He was living at home with a caregiver, went into a rapid decline. The timing of the stages is not in her or your hands, it can be years or a psychotic break that happens in days. Sure you have heard of this classic...reading The 36 Hour Day may help you regain some perspective. Even better information already added by Bev!

I didn’t know about the Ketogenic Diet then, but two popular books now are Dales Bredesen, The End of Alzheimer’s (bestseller in Amazon still, was in Costco and library) and The Alzheimer’s Antidote by Amy Berger. (Not as well publicized, but she has great info on her website http://www.tuitnutrition.com/p/alzheimers_13.html and some good podcast interviews, check the one with Dr Perlmutter. Btw, Grain Brain is a $3.99 Kindle Deal Today...some related info in that book.
Many of us on this forum have been through what you are feeling now. We understand, we sympathize, and also wish for you that a change in diet will make some difference in the daily sadness and stress of this disease.

EDIT ADD: just received notice of a free docuseries with Dr Mark Hyman on The Broken Brain, starting Jan 17. https://brokenbrain.com/trailer/?oprid=2501