Saint Anything by Sarah Dessen

When a drunk-driving accident lands favorite son Peyton Stanford in jail, his younger sister Sydney is left adrift, trying to pick up the pieces of her shattered existence and find her place in the world. When the Chathams, a close-knit family who run a pizza shop near Syndey's new school, whirl into her life, she begins to feel truly accepted for the first time. With their help, will she be able to accept herself in the new normal that is her life?