Describe three different theories of why Stargirl was at Mica Area High School.One is the conspiracy theory, but I can't find the other two.

Jerry Spinelli's Stargirl is a novel
about being an individual in a world of conformists. When Stargirl shows up at Mica Area
High School (MAHS), no one can quite believe she is for real. MAHS is a place where
being an individual is not a good thing. In fact, Leo
says:

We all
wore the same clothes, talked the same way, ate the same food, listened to the same
music. Even our dorks and nerds had an MAHS stamp on them. If we happened to somehow
distinguish ourselves, we quickly snapped back into place, like rubber
bands.

Into this world of
conformity comes Stargirl, who sings "Happy Birthday" to people in the cafeteria and
wears outlandish outfits. Her most outspoken and openly antagonistic critic is Hillari
Kimble--snobbish cheerleader and leader for the "elite" group at MAHS. She is the one
who espouses the theories about Stargirl's presence at Mica
High.

I'm not sure what, specifically, you mean by
"conspiracy theory," but in chapter two of the novel Hillari speculates that Stargirl is
part of a government plot. She continues her ridiculous and outrageous speculation by
saying she was sent to shake up the student body and dispel the apathy which is so
rampant at MAHS. In other words, she will give students something to actively rally
around--or, in this case, against. Hillari is adamant that Stargirl is a fraud, and
others believe what she espouses.