Respectfully, proper technique is just a matter of searching and reading for 2-3 minutes followed by a bit of practice and repetition to get fast. You can skip the getting fast part if you want. Nobody needs "training" to become proficient with a kitchen knife.
She doesn't care. It's not possible to force someone to be a gear nerd.
She cooks, she enjoys it, she does it with a medium sharp knife that doesn't slip because that's not a real thing, and isn't scaring her because it's just medium sharp.
