I certainly think that the ending line can be seen as a form of resistance on the part of Sylvia. The idea of defeat is something that Miss Moore wishes to teach the students to overcome. The entire premise of "the lesson" was to instruct students about financial inequality in the world. It was also designed to initiate a reflection of change and transformation in the students. If one were to examine this in Sylvia's thinking, when she breaks off from Sugar and thinks about the events of the day, the lesson, her idea of "ain't nobody gonna beat me at nuthin'," can be seen as a form of resistance within her. It can be seen as the idea that she has been exposed to what she is up against in society and her desire to emerge victorious is evident in her resolve not to be defeated. Sylvia recognizes "the other" and will not succumb to it could be one meaning of her statement. She is going to think about the day's events and within this reflection, something will be triggered in terms of thought. While we don't know what her thoughts are, we know with this line that she has struck a chord of resistance and this is something that Miss Moore hopes can be applied to a social setting.