Who is Jules Anthony from Bounce and what is their importance?

Jules Anthony is Ev's best friend in Boston. Even though she is 13 too, Jules still has stuffed animals all over her bed. Jules has an older sister that is off to college at Yale. After Ev moves away, Jules starts to change. She gets her braces off and she starts hanging around with boys and girls that once made fun of her. Jules realizes that Ev is still her best friend after one of Jules's new friends starts going out with the guy that Jules was dating.