Yet you've decided that the best solution for her is an OS that requires debugging miscellaneous hardware and driver issues and runs a mishmash of software with no consistent UI language.
As opposed to MacOS and Windows which just work, used throughout the world on a daily basis by the majority of the world, and have tangible results in terms of productivity benefit.
Honestly I think there are bigger underlying issues here, like listening to your partner and understanding their needs instead of forcing your opinion on someone who doesn't want it.