I literally set up Ubuntu for my mother (an old lady by now) 10+ years ago, and she has absolutely no problems with it other than the occasional LTS version updates that I need to do for her. I am pretty sure the overall tech-support I had to do for her over all these years is actually lower as it is much more difficult to accidentally mess up a desktop Linux than some Windows installation.
I live a few hours away from her and can’t just go out and buy her a new mouse (and she doesn’t like online shopping), so the OP story could be exactly her to the letter (except she isn’t using Linux Mint).