Similar story for my mom. She was used to windows because at work she used locked down, centrally managed, IBM thinkpads for many years. The trick is that those were secure and managed. If anything didn't work, they just got swapped by IT for another clean one.
But she always had problems with her private laptop, and no assistant or IT department to fix it. We thought she needed a windows one because that is what she knew, but the switch to a macbook air took maybe a week or so to adjust to.
It was a bit of a gamble, since I don't own a mac so supporting one via phone would be very tricky. But she has had the macbook now for years and I've had to do absolutely zero tech support on it. For emails, Word documents and some web browsing it really just works.