[5] Following Deeming's participation in the rally, then-leader of the opposition John Pesutto announced that he would move to have her expelled from the parliamentary Liberal Party.

[1] Deeming stood as a candidate for the Liberal Party in the lower house for the seat of St Albans at the 2014 Victorian state election.

[13] At the 2018 state election Deeming stood as a candidate for the Liberal Party for the upper house Western Metropolitan Region seat in the Victorian Legislative Council.

[14] Deeming stood as a candidate for Watts Ward at the 2020 Melton local election on 24 October, receiving 21.49% of the primary vote and successfully securing the second allocation.

[15][16] Following the 2022 Australian federal election, it was reported in The Age that on 26 March the Victorian Liberal Party's administrative committee voted for Deeming to run in the lower house seat of Gorton.

[22] On 18 March 2023, Deeming spoke at an anti-trans rally, which she helped British anti-transgender rights activist Kellie-Jay Keen-Minshull organise in Melbourne.

[23][7] The neo-Nazis repeatedly engaged in Nazi salutes and carried far-right extremist banners (including one that compared transgender people to paedophiles), which sparked clashes with counter protesters who attended the rally.

[26] It was reported that Deeming was also supported by Chris Crewther, Matthew Guy, Bill Tilley, David Hodgett, and Ann-Marie Hermans.

[26] After failing to delay a vote on Deeming's expulsion, Liberal MPs lobbied Pesutto for a less severe punishment over her role in the rally.

[28] The compromise came after Deeming issued a private statement in the party room, condemning Keen-Minshull's previous use of a Barbie wearing a Nazi uniform on her social media as a "poor distasteful joke".

[29] Deeming reportedly returned to threatening the Liberal Party leader again after sending a letter reiterating the threat of a defamation case.

[37] On 22 December Pesutto called a Liberal party room meeting for 15 January 2025 to discuss his motion to readmit Deeming, stating that an "absolute majority" now existed to do so.

[40] In her maiden speech before the Legislative Council, Deeming stated that she was against Victoria's Safe Schools program, transgender people accessing toilets corresponding to their gender, and the decriminalisation of sex work.

[21][40] In 2020 she described the "watch and wait" approach for treating gender dysphoria as "highly successful, low risk"[43]—in line with the Victorian Liberal Party's statement that while they oppose gay conversion therapy, the Andrews' government legislation "allows government interference in the relationships between medical professionals and patients," and "unfairly targets psychiatry and psychotherapy specifically".

[44] On 18 March 2023, Deeming spoke at an anti-trans rally, which was part of anti-transgender rights activist Kellie Jay Keen's speaking tour.