What three events show that people are beginning to mistrust Stargirl?

People begin to mistrust Stargirl when her unique behavior, such as cheering for the opposing team at a Basketball game, alienates her classmates. This is further exacerbated when she defies social norms by refusing to conform to the school's expectations, leading to gossip and suspicion about her motivations. Finally, her relationship with the popular boy, Leo, brings scrutiny, as peers question whether her eccentricity is genuine or a ploy for attention. These events collectively illustrate the growing skepticism surrounding her character.