Daveigh Chase was 7 in Michael Landon, the Father I Knew when she played the character 'Shawna Landon - Age 8'.
That was over 25 years ago in 1999.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 33, and has starred in 26 movies in total, 25 of those since Michael Landon, the Father I Knew was released.
In Michael Landon, the Father I Knew, I think Daveigh Chase looks: