What is the author's purpose?

The author is writing from a ninth grader's point of view in the book '' Speak.'' The author, Ms. Anderson, tries to show the loneliness a student who called the cops and busted up a summer party. Melinda, the main character,is being avoided by her friends. Rachel Bruin is Melinda's ex-best friend. Melinda would really like to tell Rachel what really happened the night of the party.