I am encouraged that she has 8 yrs between MCI dx and current state. Looking back I suspect my Mom, who died at age 83, had MCI ~ 70. It is difficult to peg my own onset. For me I was still productive as a banking risk exec at 70- but occasionally heard from my team “you already mentioned that”. There are numerous defenses for that scenario, but I suspect that was the beginning of noticeable decline. I always hoped I would have the grace to retire before my skills began to decay. So I retired in 20, did a short term gig for a couple of years and then retired for good.
Before Risk Management I had a 10 year career in Neurophysiology and Hospital Administration. So i have been putting that limited knowledge to work finding a neuro doc, getting all the tests except pet - only because m’care won’t cover it. I may self pay soon - but I have all indicators of increased risk for AD.
Is your wife on any of the available meds? I just was reading about a new sleeping med that seems worth learning more about - Belsomra (suvorexant).
So far the benefit seems marginal on the available Rx. But that is summary level analysis.

I told you I do go on. My full time job is seeking any credible or possible path to delay, defer, or defeat. Keeps me busy between puzzles 🙂

Take care.

This is an awful lot to deal with and I'm sure being a doctor is little help. We're all reduced to the same level eventually. I hope you have plenty of support. Don't be shy about seeking out understanding people. Perhaps some former patients? Best of luck. Hang in there.