Williams’ other television appearances include guest starring in four episodes of the BBC science fiction series Doctor Who (2015), the British docudrama television film Cyberbully (2015), and the British science-fiction teen thriller film iBoy (2017). She had co-starring roles in films such as the romantic period-drama film Mary Shelley (2017), the animated prehistorical sports comedy film Early Man (2018), and the romantic comedy-drama film Then Came You (2018). Williams also voiced Cammie MacCloud in the American animated web series Gen:Lock (2019–present).
Williams is also an internet entrepreneur. In 2019, she jointly developed and co-launched the social media platform Daisie, a multi-media networking app designed to be an alternative means to help artists and creators (especially those who are trying to get started) in their careers. One of the main purposes of the platform is to support collaboration between creators on artistic projects from across various creative industries, as well as a hosting service upon which creators can showcase their own and joint work.