Final answer:
Agatha realizes that her beauty hasn't brought her the happiness and fulfillment she had hoped for.
Step-by-step explanation:
When Agatha saw her reflection in the mirror and realized that Professor Dovey hadn't changed her at all, she came to the realization that her beauty hadn't brought her the happiness and fulfillment she had hoped for. The mirror showed her true self, beyond her physical appearance, and she realized that her superficial beauty didn't define her worth or bring true happiness. This realization may have made her question her values and priorities, and perhaps led her to seek a deeper understanding of herself and others.