[7][8] Williams began her career working as a probations officer in Panmure, encountering many people in the court system for relatively minor offences, prompting her advocacy for justice reform.

[1] Williams stood for the Hunua electorate in the New Zealand House of Representatives in 2014 election for the Labour Party where she placed second, losing to Andrew Bayly by the large margin of 17,376 votes.

[12] In May, Wall's partner and lawyer Prue Kapua contacted the national party council, claiming that Williams's application was late, and warned that legal action would be taken if it was not rejected.

[14] During the 2020 general election held on 17 October, she beat National candidate Nuwi Samarakone by a margin of 17,179 votes.

[18] In late November, Williams was appointed as Assistant Whip, and spokesperson for commerce and consumer affairs, building and construction, and state-owned enterprises in the Shadow Cabinet of Chris Hipkins.

Kāinga Ora drew criticism from Housing Minister Megan Woods and deputy Opposition Leader Nicola Willis on the grounds of professionalism and compromising its political neutrality.