Ruined (by Paula Morris)

Rebecca couldn't feel more out of place in New Orleans, where she comes to spend the year while her dad is traveling. She's staying in a creepy old house with her aunt Claudia, who reads tarot cards for a living. And at the snooty prep school, a pack of filthy-rich girls treat Rebecca like she's invisible. Only gorgeous, unavailable Anton Grey seems to give Rebecca the time of day, but she wonders if he's got a hidden agenda. Then one night, in Lafayette Cemetery, Rebecca makes a friend. Sweet, mysterious Lisette is eager to talk to Rebecca, and to show her the nooks and crannies of the city. There's just one catch. Lisette is a ghost.