"A Cry in the Night" by Ellis Carol.

Background
Molly and her family were having a vacation at an old house in an old town called Lynnton. It started as a regular family vacation but soon Molly discovered that something frightening was going on. She saw a ghostly young girl wandering the town, disappearing and reappearing unexpectedly, awakening Molly in the middle of the night with her desperate cries of "Mother!" But only Molly could see her or hear her.
Seeking to help the girl Molly searched the history of the village and uncovered a dark secret that has been hidden for nearly three hundred years. She found out that the…