Can someone please help me in finding our what the title of this book is?! I read this book a couple years ago and it was really good, but I can't remember the name of it. It was about this young girl with flaming red curly hair who lived as a peasant. This girl made friends with a prince, I believe, but that friendship was strained when the prince didn't acknowledge her in front of his friends. Later from the incident with the prince, the girl goes home only to find out that she was adopted and her real father was some nobleman that gave her away after her mother passed from giving birth to the girl. The girl is then sent to live with her father who treats her coldly, along with his new wife and step daughters. However while her father is dismissive of the girl, his wife and step daughters were worse towards her out of spite. The only one who was kind to the girl was one of the step daughters that was mute. One day the wife locks the girl in a closet but the mute girl let her go. Later the prince from her childhood comes to where the girl was living after searching for her for years. After looking into some magic mirror he sees a warrior with hair of fire waving a white flag in a battlefield. The prince recognizes the warrior as the girl and finally sees her again.

That's about as much as I remember of the story. I feel like the name of the books was Beatrice or Beatrix but I can't remember.

Does anyone know this book?