[1] Before her retirement from the diplomatic service in April 2016, she served as the Permanent Secretary at the Ministry Foreign Affairs and East African Cooperation, for a period of seven months, between May 2015 until December 2015.

[1][2] She also served as the first Executive Secretary of the International Conference on the Great Lakes Region (ICGLR), based in Bujumbura, Burundi, from 2006 until 2011.

[3] From 1977 until 1980, Liberata studied at the University of Dar es Salaam, graduating with a Bachelor of Arts degree, majoring in Political Science and International Relations.

[1][3] While Liberata is a career diplomat, she did not enter into politics until her appointment by President Jakaya Kikwete, as the Permanent Secretary at the Ministry of Foreign Affairs in 2015.

[2] Following the sudden death of president John Magufuli, she was appointed as the new Minister of Foreign affairs on 31 March, 2021 in the 6th Cabinet of Tanzania.