On 8 November 2016 she was appointed as the United Nations Deputy Special Representative and Deputy Head of the United Nations Support Mission in Libya (UNSMIL).
[1] Do Valle Ribeiro graduated from the University of Wales with a Master of Science in economic development policy and planning.
[3] Do Valle Ribeiro has held many positions as a United Nations representative.
She has held several positions with UNICEF in Africa, Guyana, Suriname and Trinidad and Tobago.
[1] In May 2019 during the 2019 Western Libya Offensive, she stated that the 18 May militia attack on the Great Man-Made River project, which supplies most of Tripoli's water, could constitute a war crime.