The Ghost in the Attic (Haunting with Louisa, Book 1)

Dee Forest, 13, has barely recovered from her mother's accidental death when her grief-stricken father sends her to live, temporarily, with Aunt Winnifred. Dee hates leaving her familiar surroundings for the quaint inn her aunt runs on a New England island, but Winnifred's easygoing manner hastens the adjustment. Getting acclimated to the 13-year-old ghost in Dee's room is another matter, yet Louisa Lockwood, who died in a fire 100 years ago, soon becomes a good friend.