Along time ago in the 90s I was at a Alzheimer seminar which had a lot of people attend including people in early stages telling us what it’s like. One person said that it is natures way of telling loved ones to get ready to say goodby. I don’t accept that even if I understand it. They are in trouble and we need to fix it.
When you mentioned big pharma there are some medicines that can cause cognitive issues. Statins a common drug that lowers cholesterol which you brain needs is one as well as muscle damage due to depletion of Coq10.Your hearts a muscle.
If you do a protocol like that of a book or Buck institute which deals with the whole body there are things you can do before you leave. If there’s vitamins or supplements you can date them. Meals can be pre planned. Time a day for exercise or meditation can be timed. Won’t be as good as you there but helps.
From what you’ve said she probably shouldn’t be alone anymore. They have GPS watches now meant for kids but could be used in cases like memory loss.