"She will develop muscle memory faster than if she's looking all the time"

My dad learned in the 1920s - any such 'aids' then were not acceptable. You were expected to just 'learn'... :-)

I'm reminded of the advice given to pipe organists regarding the pedal keyboard.

"When playing, you only look at it twice briefly. Once when you sit down to check that you are seated correctly. The second time, as you get up and leave the instrument, so you don't trip over the damn pedals."