Well, first of all, is it worthy? If she uses photoshop and stuff like that, maybe she just can’t switch / it’s just not worthy. If she uses excel, it’s only getting used to libreoffice. If she uses stuff on browsers, well she can switch easily. If she’s in the second or third category, just say this things: free, open source, fuck microsoft/apple/google, no viruses, it can run even on toaster, I always used it and never had problems (don’t laugh while saying this), r/unixporn, active community and more stuff that I can’t think of rn. If you’re lucky at this point she’ll want to switch and then just guide her in the distro choose.