When my shy daughter was in kindergarten, another girl kicked her and taunted her. We roll played it at home, and she practiced saying “STOP IT.” It worked. The girl backed off. A few weeks later, the girl invited my daughter to her birthday party.
This year, she is in high school. She is still shy and awkward. But the other day she defended a boy who was being harassed by a mean girl. She had to say it twice to get her message across, but it worked again. In fact, the girl apologized to the boy the next day.
I told my daughter that I was prouder of her than if she had gotten an A on her report card, because she stood up to evil and defended the innocent.