That was over 26 years ago in 1995.
Today she is 41, and has starred in 53 movies in total, 45 since Casper was released.
In Casper, I think Christina Ricci looks:
Casper scores 6 out of 10 on The Movie Database.
Christina Ricci's first acting role was as 'Kate Flax' in Mermaids, released in 1990 when she was 10.