Sioka was born on 18 September 1960 in Kasheshe village in the
Zambezi Region and attended primary school in her home village. At age 15, she went into exile in
Zambia, due to the ongoing conflict in
South West Africa between the apartheid led military and the Namibian freedom fighters. When she was injured in a
South African Defence Force raid on
Oshatotwa in 1976 she decided to join the
People's Liberation Army of Namibia, during which she participated in the attacks on
Katima Mulilo in 1977 and 1978 as one of only three female insurgents.{{cite news After the 1978 attack she worked for
Voice of Namibia, SWAPO's exile radio station, and furthered her education. She received a certificate in journalism and library information in
Ndola and completed secondary school at Roosevelt Secondary School for Girls in
Freetown,
Sierra Leone. Sioka then worked as teacher at
Namibia Health and Education Centre in
Kwanza-Sul,
Angola, until shortly before
Namibian independence. ==Political career==