Against the Rules (Sweet Valley Twins, No 9)

Against the Rules (Sweet Valley Twins, No 9) by Francine Pascal. paperback edition. ISBN: 9780553155181.

Sophia Rizzo is a good writer on the school newspaper, shes nice, and Elizabeth likes her. But all the other kids at Sweet Valley Middle School--including Elizabeths twin sister, Jessica--make fun of Sophia because her family is poor and her brother is always in trouble. Even Elizabeths parents tell her to stay away from Sophia. To show Sophia that shes her friend no matter what anybody says, Elizabeth decides to go against strict orders from her parents and throw a secret birthday party for Sophia. But is Elizabeth willing to pay the price if shes caught?