That was over 26 years ago in 1995.
Today she is 71, and has starred in 94 movies in total, 68 since Copycat was released.
In Copycat, I think Sigourney Weaver looks:
Copycat scores 6.4 out of 10 on The Movie Database.
Sigourney Weaver's first acting role was as 'Alvy's Date Outside Theatre' in Annie Hall, released in 1977 when she was 27.