Makepeace joined the
Green Party of England and Wales (GPEW) in Lewes in 2015. She was elected as a town councillor for the Lewes Priory constituency and, in 2019, as a councillor for
Lewes District, also representing Lewes Priory. She has served on the Buildings and Amenities Committee and the Planning Committee. In 2023 she became deputy mayor of Lewes. Following her resignation from the GPEW in April 2024 she was elected by the council as the new mayor of Lewes on 9 May 2024. For her inaugural address she wore the
patchwork Coat of Hopes, which was originally worn on a walk from
Newhaven in Lewes District to
Glasgow on the occasion of the
2021 United Nations Climate Change Conference (COP26) and was created by local artist Barbara Keal. Her resignation from the GPEW stemmed from her disagreement with the party's policy on
trans women. She resigned on 3 April 2024, soon after reading the email from the party's complaints manager informing her that she had been put on a "No Fault Suspension" (NFS). She stated that party members had previously had the right to disagree with party policy if they prefaced their statements with "this is Green Party policy, however, I disagree." However, the rule was no longer being applied in the case of the policy towards trans women and members were expected to support the party line. She said that she had previously stated that she did not agree that men could become women, a view she had held since joining the party in 2015. ==Extinction Rebellion==