You could install Mint on your mother's computer and don't tell her, and she'd probably still think she was using Windows until it came time to install new software. Linux For Normies has come a long way, especially recently. It could be ready for mass adoption very soon, if not already.
I donโt know how to feel about this. Because the intelligent guy is totally me, but I also recognise that Linux is in no shape for a non tech literate person just to jump into.
save