Alexander became a member of the
Democratic Alliance and stood as the DA's ward councillor candidate in ward 134 in the
City of Johannesburg Metropolitan Municipality in 2016. The ward included parts of
Northriding,
Northgate, parts of Boskruin,
Randpark Ridge and Sundowner. Alexander won and became the councillor for the ward. She was appointed deputy chairperson of the Johannesburg Regional Selection Panel and the chairperson of the Political Support Cluster of the DA's caucus in council. In 2018, Alexander was nominated to be the DA's candidate for Gauteng premier. Tshwane mayor
Solly Msimanga was ultimately selected to be the party's premier candidate. In April 2020, Alexander was appointed chief whip of the DA's caucus in the Johannesburg City Council.
Tyrell Meyers, also from the DA, replaced Alexander as the DA's caucus chief whip and also became the Chief Whip of the Council. On 28 January 2022, Alexander was elected chairperson of the council's Section 79 committee on Transport. She was removed as committee chairperson in October 2022. On 16 November 2022, Alexander became a
Member of the National Assembly of South Africa for the DA. She was appointed an Additional Member on the Standing Committee on Finance by DA leader
John Steenhuisen on 21 April 2023. Alexander was elected to a full term in the
2024 general election. ==References==