In the book Stargirl, what did Hillari Kimble do to Stargirl and what was Stargirl's reaction?

I am
assuming that you are asking about the incident between Hillari Kimble andthat takes place near
the end of the book at the Ocotillo Ball.  In that incident, Stargirl spontaneously leads a
large group of students in the Bunny Hop.  These students have so much fun and are so wrapped up
in what they are doing that Stargirl leads the Bunny Hop line out of the Country Club and out
onto the golf course.  They are gone for quite awhile.  In the meantime, Hillari, furious at not
being the center of attention, demands that the band play "regular music" and drags
her boyfriend out on...