That was over 8 years ago in 2013.
Today she is 31, and has starred in 36 movies in total, 13 since Short Term 12 was released.
In Short Term 12, I think Brie Larson looks:
Short Term 12 scores 7.9 out of 10 on The Movie Database.
Brie Larson's first acting role was as 'Courtney Enders' in Right on Track, released in 2003 when she was 13.