 Also in 2017 Williams appeared as Isabel Baxter in, "Mary Shelley" a romantic period-drama film directed by Haifaa al-Mansour and written by Emma Jensen.In 2018 she was the voice actor for the character "Goona" a Bronze Age fearless rebel tomboy football enthusiast in Nick Park's animated prehistoric comedy sports film "Early Man" that also featured Eddie Redmayne and Tom Hiddleston, though both Gwilym Mumford of "The Guardian" and Kate Stables of the British Film Institute noted that her accent varied during the film.From 18 October to 24 November 2018, Williams starred as Caroline in the stage play "I and You", which was written by Lauren Gunderson.