Stefanie Martini was 25 in Crooked House when she played the character 'Sophia de Haviland'.
That was over 7 years ago in 2017.
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 5 movies in total, 4 of those since Crooked House was released.
In Crooked House, I think Stefanie Martini looks: