Arch is too much work. I know it doesn't look like it to people who love to fiddle, but it's true.
I don't want to babysit my computers. My wife would also not be amused
I don't want to babysit my computers. My wife would also not be amused
The only thing with arch that is blocking a non-techy/fiddle-unfriendly person is the installation process (even with the script, knowing what a DE is, making a conscious decision which to choose, KDE etc)
I think your definition of "non-techy/fiddle-unfriendly" is quite different from the rest of the population.
Also note, that just because you happened to had months of no problems, that does not mean it will be the same experience for someone else. Speaking of it: for a non-techy person, using the terminal is already a problem.
What OS is she using now?
As a young teenager I got the bright idea to get my mother using Linux. Later I bought her a Mac and she was much happier. Wish I'd thought of that sooner.
(I have no particular attachment to any OS (hate them all equally ;), it's mostly a matter of what you're used to, and picking the right tool for the job.)