Band of Angels (1957)

You're no blue blood any more, honey. The master bought you...and now he's waitin'!

Living in Kentucky prior to the Civil War, Amantha Starr is a privileged young woman. Her widowed father, a wealthy plantation owner, dotes on her and sends her to the best schools. When he dies suddenly Amantha's world is turned upside down. She learns that her father had been living on borrowed money and that her mother was actually a slave and her father's mistress.