In 2019, she starred in the voice cast of "", an American animated web series, set in a dystopian future, which is broadcast on the Rooster Teeth subscription service. Williams voiced the role of Cammie MacCloud, a mischievous Scottish hacker, in a cast that included Michael B. Jordan, David Tennant and Dakota Fanning. Also in 2019, Williams starred alongside Asa Butterfield and Nina Dobrev in the coming of age romantic comedy-drama film "Then Came You", in which she played a teenager with a terminal illness. Frank Scheck of the "Hollywood Reporter" felt that Williams made her "sprightly character appealingly vulnerable". The film premiered at the Woodstock Film Festival on 12 October 2018 and was released nationwide in 2019.