Louis XVI’s sister.
She was the best ally of Marie Antoinette. She acted as Marie Teresa’s (Marie Antoinette’s daughter) mother during the royal family prison in Temple until her execution in 1794.
She showed up briefly in Episode 16—"Mother, Her Name is…". The first time when Oscar brought Rosalie to the ball hosted by her. Madame Elisabeth promised to send money to Jeanne when she saw Jeanne fainted on the sofa.