That was over 13 years ago in 2008.
Today she is 35, and has starred in 39 movies in total, 28 since Mamma Mia! was released.
In Mamma Mia!, I think Amanda Seyfried looks:
Mamma Mia! scores 6.5 out of 10 on The Movie Database.
Amanda Seyfried's first acting role was as 'Karen Smith' in Mean Girls, released in 2004 when she was 18.