[1] Leoni attended King's College London and received a master’s degree in economics and international politics.

[3] Leoni spent 10 years of her life living in London, where she ran a contracting business and was a member of the cultural group Ngāti Rānana.

[4] Leoni was elected to the Waitematā Local Board in 2019 on the City Vision ticket.

[6] On 23 February 2020, Leoni was selected as Labour's candidate for the Waikato electorate for the 2020 election,[7] officially launching her campaign in August.

[4] Despite a strong pro-Labour swing, Leoni lost to the incumbent National MP Tim van de Molen.