The Secret Life of Sparrow Delaney by Suzanne Harper (2007)

Fun novel about a girl who has the ability to see and talk to ghosts. She comes from a family of mediums and lives in Lily Dale, an enclave of spiritualism, but is trying to start a new life at her new school without anyone knowing she's psychic. Of course, it doesn't really work out very well, due to one persistent ghost who won't leave her alone. Great characters, especially those of Sparrow and her family, make this a fun, supernatural-themed read.