What does Zitkala use in this passage as evidence of her mistreatment?

In this passage, Zitkala-Ša uses multiple instances of her experiences and observations as evidence of her mistreatment. This includes being pulled by the hair, having to speak English and adopt white customs, being forced to cut her hair, and being stripped of her Native identity. These experiences collectively serve as evidence of the physical, emotional, and cultural mistreatment that she faced as a Native American student at the Carlisle Indian Industrial School.