That was over 6 years ago in 2015.
Today she is 27, and has starred in 26 movies in total, 9 since Lost River was released.
In Lost River, I think Saoirse Ronan looks:
Lost River scores 5.8 out of 10 on The Movie Database.
Saoirse Ronan's first acting role was as 'Briony Tallis (Age 13)' in Atonement, released in 2007 when she was 13.