King had a role in Christopher Nolan's third Batman film, The Dark Knight Rises (2012), as a young Talia al Ghul. As well, she appeared in Taylor Swift's ' Mean' music video as a young student at the school cafeteria rejected by her peers. Also in 2011, she co-starred in Crazy, Stupid, Love. King was featured in Battle: Los Angeles, where she played a girl named Kirsten. She also released a single for the movie called 'Ramona Blue'. King's first lead role was in the 2010 film Ramona and Beezus, an adaptation of the Beverly Cleary book series, starring as Ramona Quimby. Other television appearances include Entourage, CSI: Crime Scene Investigation, Medium., and Life in Pieces.

She was also featured in The Suite Life of Zack & Cody as Emily Mason in two episodes. In 2010, she guest-starred in the series Ghost Whisperer. She then voiced the yellow fur ball Katie in the animated feature Horton Hears a Who! (2008), and Beaver in Ice Age: Dawn of the Dinosaurs (2009). King made her film debut in Reign Over Me as the main character's daughter. King has stated that she is 'part Jewish and part Christian, but I'm mostly Jewish'.

She has two older sisters, actresses Kelli King and Hunter King.

She also performed with the Stage Door Children's Theatre in Agoura. As a child, King sang a cappella for a talent show at the Simi Valley Cultural Arts Center. King attended Phoenix Ranch School in Simi Valley. She has also been in commercials for AT&T, Kay Jewelers and Eggo. King began acting professionally at the age of 4, starting with a commercial for Life Cereal. King was born in Los Angeles, California, to Terry and Jamie King.

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