Then the distro doesn’t matter that much. You shouk go for either Snaps or Flatpaks for applications as they won’t break the system even if something catastrophic happens.
Personally I’d go for distros with great deal of support (Pop, Fedora and Mint) and put Flathub as the main source in the respective app stores. Smaller distros tend to have more issues that requires some troubleshooting at times.
Check how does she uses Ubuntu first though, if she’s using the Canonical’s additions to Gnome a lot, she’ll have a horrible time with vanilla Gnome as it’s pretty barebones, that’ll rule out any distro with vanilla Gnome such as Fedora. Trust me, you don’t want to be babysitting your partners computer.
What? These things are not related to each other by a good margin. In fact, since the FOSS is completely orderless, it goes against communism; which requires some sort of order just to be able to function. But either way, the parallel is not there or questionable at best, not to mention irrelevant.
Can we NOT drag useless politics into FOSS?