Olsen twins' little sis delivers stellar performance in 'Martha Marcy May Marlene'

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PHOENIX -- You've probably heard of the Olsen twins -- Mary Kate and Ashley ("Full House") -- but did you know they have a younger sister who is also an actress?

Elizabeth Olsen is making a splash in the entertainment world thanks to her stellar performance in her first big film, "Martha Marcy May Marlene."

Olsen plays a young woman who is trying to reconnect with her family after running away from a an abusive cult. As the film progresses, the family learns little by little what might have happened during her "missing years."

The psychological thriller won top awards at this year's Sundance Film Festival.

It's Olsen's first big role out of school.

"I feel privileged to have gone to the Acting Conservatory I did in New York," she said. "One of the main things that they make clear is that you are not your character. ... It's not actually you going through these things. ..."

Olsen, who is a bit more reserved than the twins, left school to do the film, but is now back in classes.

She said she doesn't ask her famous sisters, who practically grew up on TV, for career advice.

"It's outwardly never spoken about," Olsen said. "If I do have questions, it usually has more to do with events because events make me uncomfortable. ... You have to talk to all these people as if you're important and you're not. Other people are important, but I'm not, so it makes me really uncomfortable. I realize that they've done this their entire lives."

Olsen, 22, has has four other movies in various stages of production -- "Peace, Love, & Misunderstanding," is due out this year. "Red Lights" and "Liberal Arts" are both in post-production, due out next year, and "Very Good Girls" is in pre-production.

"Martha Marcy May Marlene" opens this weekend. It's rated R.