Formerly a local councillor in the Cape Winelands, Nalumango rose to prominence as the interim coordinator of the Western Cape branch of the ANC, a position she held between 2019 and 2023. During that time, in December 2022, she was elected to a five-year term on the ANC National Executive Committee. The election took place at the ANC's 55th National Conference, during which Nalumango also stood unsuccessfully for election as deputy secretary-general of the ANC.
Shortly after the 2019 election, the ANC's national leadership disbanded the incumbent Provincial Executive Committee of the Western Cape ANC. Thereafter, on 15 August 2019, Nalumango was appointed to the head of the 30-member interim provincial committee (IPC) that was tasked with leading the provincial party until fresh leadership elections could be held. She was appointed as coordinator of the IPC, while Lerumo Kalako served as its convenor.[7]
Nalumango and Kalako held those positions during the party's preparations for the 2021 local elections in the Western Cape. In the run-up to the elections, Kgalema Motlanthe, the head of the ANC's internal electoral committee, recommended that Nalumango should face disciplinary proceedings for alleged mismanagement of the candidate selection process and related dereliction of duty.[8] Nalumango's duties also included ex officio membership in the ANC National Executive Committee (NEC). At an NEC meeting in November 2022, News24 said that Nalumango was "among the first" to call for President Cyril Ramaphosa to step aside from his office due to the Phala Phala scandal.[9]
ANC 55th National Conference: 2022
In December 2022, as IPC coordinator Nalumango attended the ANC's 55th National Conference at Nasrec, where the party resolved to amend its constitution to create the position of ANC second deputy secretary-general. In the early hours of 18 December, Nalumango was one of two candidates nominated from the floor of the conference to stand for election to that office. She was viewed as aligned to the campaign of presidential candidate Zweli Mkhize, while her opponent, Maropene Ramokgopa, was a close ally of incumbent ANC president Ramaphosa.[10][11]
On 19 December, Ramokgopa was named as second deputy secretary-general, having received 2,373 votes against Nalumango's 1,948.[12][13] However, the conference elected Nalumango to a five-year term as an ordinary member of the NEC; by number of votes received, she was ranked 66th of the 80 ordinary members elected, receiving 1,067 votes across 4,029 ballots.[14]
At the NEC's first meeting in February 2023, Nalumango was elected as convenor of the NEC's delegation to the party's provincial structures in the Northern Cape.[15] The Cape Argus reported that she would resign from the Western Cape IPC in order to take up her duties in the ANC's national leadership.[16]
National Assembly: 2024–present
Ahead of the May 2024 general election, Nalumango stood as an ANC candidate, ranked 29th on the party's national list.[1] She was elected to a seat in the National Assembly, the lower house of the South African Parliament.[6]