I have a variety of tactics that I apply according to the personality of the individual:
- record her playing to show how the mistakes sound nowhere near as bad as she thinks they do.
- playing the 'how many marks do you get left with' game. Even adults will happily play this. The student starts with 10 marks (or 20 or, in extremis 30

), performs the piece and looses a mark only for allowing mistakes to affect her fluency and musicality. This little 'game' can be applied to any situation at any age. I start with a 50% target and bump up from there.
- promise chocoholics a choc if they can give a performance whose fluency and musicality is unaffected by mistakes.
- demonstrate how wrong notes are the least important of mistakes.
- unadorned praise the entire time she is playing.
- 'tough love'. This takes 2 forms: 1) tell her to stop being a self-indulgent wimp and get on with it; 2) tell her to stop being arrogant - if
I cannot play with total accuracy then she has no chance of doing so.
It usually takes a mixture of these tactics to make the difference.
Good luck with this one. We all hate seeing out students unhappy.
Steve