[5] From 1953 to 1961, she worked as a typist for Nelson Mandela and Oliver Tambo in their law practice in Johannesburg.
[2] In 1990, Mompati was chosen to be part of the ANC delegation that negotiated the peaceful transition with the South African government and conditions to be met to end political conflict in South Africa at Groote Schuur.
Upon her return from Switzerland, she was elected mayor of Vryburg, North West.
She served as an executive member of the Umkhonto we Sizwe Veteran's Association.
[2][5][7] Mompati died on 12 May 2015, aged 89, following an illness at a Cape Town hospital.