Pale Phoenix — Kathryn Reiss

Miranda isn't happy when sullen orphan Abby Chandler comes to live with her family. But Miranda's anger turns to shock when she learns the girl's horrible secret: Abby's parents and sisters were killed in a house fire in this very town--more than three hundred years ago. Somehow Abby survived the fire and has been living in a virtual limbo ever since.
Fifteen-year-old Miranda Browne, the extraordinary protagonist from Kathryn Reiss's first novel, Time Windows, returns for a new time-travel adventure.