Van Deventer later joined the
Democratic Alliance. She was nominated as the party's mayoral candidate for the
Drakenstein Local Municipality for the
local government elections of 18 May 2011. The DA won a majority of seats on the council, defeating an
ANC-led coalition that had previously governed the municipality. Van Deventer was then elected mayor with former
Independent Democrats councillor
Conrad Poole as her deputy. Van Deventer was elected to the
Western Cape Provincial Parliament in the
2014 provincial election, however, she decided to give up her seat in order to continue serving as mayor of the Drakenstein. Former
Cederberg Local Municipality councillor
Matlhodi Maseko was appointed to take up Van Deventer's seat in the provincial parliament. In 2016, Stellenbosch mayor Conrad Sidego announced that he would not be running for re-election as mayor. Van Deventer was nominated as the DA's mayoral candidate for Stellenbosch and resigned as Drakenstein mayor in May 2016. Her deputy, Conrad Poole, was voted in as her successor. The DA achieved a landslide victory in the
Stellenbosch Local Municipality in the
election on 3 August 2016. A year later, Jindela and Petersen swapped positions. In September 2021, Van Deventer was renominated as the DA's mayoral candidate for the Stellenbosch Local Municipality for the
election of 1 November 2021. The DA retained control of the municipality, albeit with a smaller majority in the municipal council. On 15 November 2021, Van Deventer was re-elected as mayor for a second five-year term. Her re-election made history as she is the first mayor of the Stellenbosch municipality to serve two consecutive terms. In October 2024, Van Deventer announced that she would be retiring from politics at the end of November 2024. Deputy mayor Jeremy fasser was elected to succeed her as mayor of the municipality. ==Personal life==