[OT] Granny-friendly Linux Distros?

[Nick Sabalausky (Abscissa)]

We've got a lot of very reasonable, level-headed Linux folk on this board:

I'm helping my mom look for a laptop to replace her ~10 year old one, 
and given all the mess Windows Update has been making of things since 
about Win7 onwards, I'm temped to just stick her on Linux (especially if 
I can't find anything still using Win7). Heck, 90% of what she does is 
just web browser anyway, with the other 10% being pretty much Linux 
compatible stuff (Hmm...although come to think of it, only possible 
exception might be her iPhone...I'll have to look into that, I'm not an 
iOS guy...).

Any suggestions on a potentially granny-friendly distro? (If such 
exists.) Personally, I use Manjaro, but I definitely don't want to set 
her up with that: While I think rolling-release would be a good fit 
(avoid the mess of periodic OS re-installs), the Arch/Manjaro updates 
all to often wind up failing and require manual intervention to fix. 
I've been able to handle that for myself, but she wouldn't be able to 
and I don't want to be the on-call extended-family IT dept...

Ideally, some rolling-release that can auto-update (preferably in the 
background) and won't force-reboot, force-interrupt you, or pull the 
Windows prank of delaying startup/shutdown for several minutes (or 
more...) for "Installing updates...you may as well go watch an entire 
series on Netflix 'cause you ain't packing up your laptop *or* getting 
any emails sent anytime soon...". Supporting rollbacks as well would be 
fantastic, but I realize that's pretty rare in Linuxland (outside of 
NixOS/Guix, but I'd say NixOS/Guix would *definitely* be a bad fit for 
other reasons...)

Would Mint fit the bill here? It's been quite awhile since I've paid any 
attention to Mint, so I'm kinda out-of-the-loop on that one. But I know 
it's always intended to be non-expert friendly.

I'm not too terribly concerned about the initial installation and setup, 
since I can just take care of that. I just don't want to be getting 
regular tech support phone calls afterwords...