You have a good wife. By all means, show her how to mow.
I involve my wife in all sorts of home maintenance tasks. I will croak sooner or later, and I want her to be prepared.
She knows how to change oil, replace an automotive or a sump pump back-up battery and maintain same, wire a circuit, snake plumbing and replace traps, sand, paint, start the mower and how to mow safely, knows when to tighten this fitting within an inch of its' life, and when not to do for that one, and so on.
And none of that is being condescending. It's simple transferring of necessary education.
Teach your wife to mow. Which means safety glasses, gloves, long pants and boots. Nerdy? I suppose. But check out the injury stats - mower injuries are huge.
I reside on a corner, so I have two "across the streets". Three young families - nice people, nice youngsters. Our neighborhood is hilly - down-dip driveways, or steep sloped lawns. I watch mowing, string trimming going on with tank tops and sandals, with their kids romping about. It's just a matter of time...