Everlost, by Neal Shusterman (Simon & Schuster Books for kids,2006)

Mrs. Moen I would like you to meet Allie the outcast. When Allie was only fourteen she was in a fatal car accident. Allie accidentally sent to Everlost. Everlost is the world between life on earth and eternal life. While in Everlost Allie wants to go home to see if her dad had survived the car crash, but is kidnapped by the one true monster of Everlost, the McGill. Allie escapes by being incredibly clever, and conceiving of many devious plans to take her to Atlantic City, New Jersey, which is right next to her hometown.