A girl and her little sister who find a magic jewelry box in the room under the stairs when they hide there during a blackout (I think) and the jewelry box somehow takes them to a magical place where the girl tries to get her little sister from the evil queen or witch queen with the help of a prince. I also thing a flying horse or a unicorn was involved but I am not sure I also think the girl got in the castle pretending to be a nanny so she can be close to her sister while trying to find a away to get her out of the castle but I'm not so sure about that part either.
