What dirty trick do her fellow cheerleaders do to punish Stargirl for cheering her apponent and the electron?

In "Stargirl" by Jerry Spinelli, Stargirl is punished by her fellow cheerleaders for cheering for the opposing team, the Electrons. They ostracize her by excluding her from their routines and social activities, effectively isolating her from the group. This act of punishment highlights the pressure to conform and the consequences of being different in a competitive environment. Ultimately, it showcases the conflict between individuality and group loyalty.