Kaitlyn Dever was 11 in An American Girl: Chrissa Stands Strong when she played the character 'Gwen Thompson'.
That was over 15 years ago in 2009.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 27, and has starred in 25 movies in total, 22 of those since An American Girl: Chrissa Stands Strong was released.
In An American Girl: Chrissa Stands Strong, I think Kaitlyn Dever looks: