It's not that I'm not willing to help, but I live abroad. If I lived close by, I would gladly install something like Ubuntu or KDE Neon on her machine (probably Ubuntu though - the mainstream would make it easier for her to find things on her own).
Whenever I'm home I help her with her computer. The whole thing is very educational for me as an interaction designer as well. It often shows how modern interfaces make her feel like she is the dumb one, when honestly it's often the arrogant UI designers who think everyone is on board with modern UX paradigms. Or worse, abuse dark UI patterns for evil purposes.
UI wise I would have helped her switch to one of the distro's ages ago, and I agree that Elementary is a good candidate.
Trying to fix her Lenovo Yoga I had to navigate a forest of dark UI patterns, with pre-installed apps trying to trick me into sharing private data every step of the way.
I really fucking hate this user-hostile attitude that can only be explained by greed. I've "fixed" her computer one more time, but I think the next time I'll let her try a bootable Linux distro, and see if she likes it enough to be willing to give it a try.
If someone asks me to help for the administration of his Linux machine, I would accept because it is so easy and so little work compared to windows. I think Linux is perfect for the noob who accept to delegate administration.