Giorgia Whigham was 20 in Sierra Burgess Is a Loser when she played the character 'Chrissy'.
That was over 6 years ago in 2018.
Today she is 26, and has starred in 7 movies in total, 5 of those since Sierra Burgess Is a Loser was released.
In Sierra Burgess Is a Loser, I think Giorgia Whigham looks: