SOLUTION
You should try to eliminate or reduce the impact of any negative consequences or results associated with good performance.
If punishments cannot be eliminated entirely, then you may have to increase the real or perceived rewards associated with good performance.
Solution Explanation:
After investigating the reasons for substandard performance, you may discover this persons is not performing as you desire because she feels good performance is somehow punishing. If punishments cannot be eliminated entirely, then you may have to increase real or perceived rewards associated with good performance. For instance, if you'd like employees to complete thankless jobs with a high degree of quality, then you might exempt them from such tasks the next time they must be done, or provide some kind of reward for good performance (recognition, lunch, etc.). Similarly, if you wish to encourage managers to come in under budget even though they might see punishments for doing so (starting with a smaller budget next year), you might provide them with an extra day off, a bonus, etc.