Answer:
Jing-mei asserts her will in the last fight over the piano lessons, which causes her mother to become angry because Suyuan thinks she has only good motivations. The way that Jing-mei "wins" is also bittersweet. She only wins the disagreement by bringing up her mother's lost children, which hurts her mother. This victory is hollow because Jing-mei doesn't get what she really wants: acceptance and love from her mother. That is why, nearly twenty years later, Jing-mei is still not over the piano incident. Her greatest fear is that her mother had given up on her. Although she is glad not to take piano lessons, Jing-mei's anguish is not due to her dislike of the piano. She is upset because she feels like her mom had set her up for failure.