The book is called Star Girl by Jerry Spinelli.
Synopsis (as posted on BarnesandNoble.com)
Leo Borlock follows the unspoken rule at Mica Area High School: don't stand out--under any circumstances! Then Stargirl arrives at Mica High and everything changes--for Leo and for the entire school.I also thought I would take a minute and introduce myself. As Mandy said I met her in DC while completing my student teaching there. I am now happily married for four plus years and had a beautiful six month old daughter. We are currently living in Minnesota (I grew up here) and my husband is hoping to be a nurse someday really soon. We are waiting to see if he has been accepted into a nursing program. Our fingers are crossed. I stay home all day and play with my daughter. Some of my hobbies include reading (dah), walking/hiking, violin and I don't know what else. I love being outdoors and I not am not too excited for the snow this year and bundling up but oh well.
Okay I hope you enjoy the book!