She became an Oscar Award nominee at age fourteen for her role in the 2010 film, True Grit. In 2013, she starred as Juliet Capulet in Romeo and Juliet and played Petra in Ender's Game.
She held her own alongside veteran actor Jeff Bridges in the Cohen brothers remake of True Grit.
She starred in True Grit with Matt Damon.
She began acting in short films at the age of eight.
Her parents are Cheri and Peter Steinfeld and she has an older brother named Griffin.