Fairytale

Sarah, a young girl has a secret that she doesn't know about. She can travel in and out of stories as any character that she wants. While she is in these stories she can make her own decisions, but she has to be careful. If she goes away from the dialogue of the book, it will change the book and possibly rewrite history.
Emily, Sarah's mother is aware of her gift ever since she was born, but she isn't allowed to tell her about it Sarah has to find out on her own.