What information does Hillari believe to be true about Stargirl and how does Kevin react to what Hillari says?

This really depends what chapter you are referring to. Hillari is your classic mean-girl antagonist. Hillari thinks Stargirl is a fraud, 'She's not real,'' Hillari said. ''She's an actress. It's a scam.'' She claimed that the administration had planted Stargirl at their school to improve school spirit. ''They think this place was too dead last year. They think if they plant some nutcase in with the students … who stirs things up, then maybe all the little students will go to a game once in a while or join a club.'' Kevin isn't as judgmental as many of the others at Mica are so I don't think he takes everything that Hillari says at face value.