Amiah Miller was 10 in House by the Lake when she played the character 'Emma'.
That was over 7 years ago in 2016.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 18, and has starred in 8 movies in total, 7 of those since House by the Lake was released.
In House by the Lake, I think Amiah Miller looks: