1. She is known for her roles in the films Silent House .
2. For her role in the critically acclaimed Martha Marcy May Marlene , she was nominated for numerous awards including the Independent Spirit Award for Best Female Lead.
3. She is the younger sister of actresses and fashion designers Mary-Kate Olsen and Ashley Olsen.
4. Olsen was born in Sherman Oaks, California, the daughter of Jarnette “Jarnie”, a personal manager, and David “Dave” Olsen, a real estate developer and mortgage banker. She is the younger sister of twins Mary-Kate and Ashley Olsen, who became famous as TV and movie stars at an early age.
5. Her oldest brother is named Trent Olsen, and she has two younger half-siblings as well.
6. She attended Campbell Hall School in North Hollywood, California from kindergarten through grade 12.
7. Olsen was nominated for and won numerous critics awards for her portrayal of the titular character Martha, a girl suffering from delusions and paranoia after fleeing her life in a cult and returning to her family. She next appeared in the horror film remake Silent House, in which she played the role of Sarah.