What are the names of Ella's stepsisters in the film "Ella Enchanted"?

In the film "Ella Enchanted," Ella’s stepsisters are Hattie and Olive.

They are the daughters of Dame Olga, who becomes Ella’s stepmother after marrying Ella’s father, Sir Peter. Hattie is the older and more domineering sister, while Olive generally follows her lead. Together, they exploit Ella’s magical curse of obedience by ordering her around and treating her cruelly.

The 2004 fantasy comedy stars Anne Hathaway as Ella, Lucy Punch as Hattie, and Jennifer Higham as Olive. Hattie’s interest in Prince Charmont also makes her a rival to Ella, adding a romantic conflict to the Cinderella-inspired story. A common mix-up is to name Olga as one of Ella’s stepsisters; Olga is her stepmother, not her sister. Another point of confusion comes from the source material: the movie is loosely based on Gail Carson Levine’s 1997 novel, which also features Hattie and Olive, though some plot details and character portrayals differ between the book and film.