iproute2 is the gold standard of command-line network configuration on Linux, and for good reason. That NetworkManager conflicts with it instead of taking proper advantage of it is the whole problem.
I don't care about your mother, she shouldn't be on the command line in the first place, and if she were with nmcli, you'd still have to explain all those terms to her (and they're very basic terms, I refuse to believe your mother is actually that stupid, mine sure isn't).
You've entirely missed the point -- repeatedly. Your mother gets to configure from a friendly GUI limited to the functionality she needs, but anyone who needs anything more advanced is screwed out of it because they can't have the GUI and direct access to underlying functionality, because the former actively impedes the latter. This is a uniquely Desktop Linux state of affairs, no other OS behaves like that.
