Always great to see more people curious about Linux, especially when the motivation is escaping ms-bullshit..
If she wants something that just works but still feels polished and professional, I’d actually give openSUSE a look. Leap is rock-solid and perfect for people who want a stable system that behaves consistently and doesn’t demand much maintenance. Tumbleweed, on the other hand, is rolling release, so it’s always up to date but still surprisingly reliable thanks to openSUSE’s testing process.
Both use YaST, which is one of the best control panels in the Linux world. You can do a lot with YaST, like manage users, partitions, updates, drivers, and networking all from one place without ever touching the terminal.
Mint is also a fine choice as well....