Im afraid your right about Alzheimers its an awful disease, my FIL had it, it was crushing. I do play CIV VI its a lot of fun. Hope I dont get it, but worried for my wife her short term memory has become a problem.
Anything you find fun should be done. I dont play video games but all my kids do and my eldest works in the industry. But no, I get so angry when trifles say that an active brain wont get it. My parents were retired and my dad took 4-5 different consulting jobs and expert witness jobs and stayed very busy. My mom was on boards and had meetings and read 2 huge historical books a week, and they played cards, traveled the world, etc. It was the Alzheimers taking away first their short term memories that caused them to stop being able to keep active, not the other way around.
And I understand your fears for your wife. Prayers up.