She approached the Rwanda Football Federation about joining a refereeing course after finishing secondary school but this was declined on the basis of her being too young again.

[9] Mukansanga went on to graduate with a degree in nursing and midwifery from the University of Gitwe.

[11] In 2022, Mukansanga became the first woman to referee at the African Cup of Nations,[12] leading out an all-woman officiating team of Fatiha Jermoumi (Morocco), Carine Atemzabong (Cameroon), and Bouchra Karboubi (Morocco) as the VAR.

In 2022 she was one of three women referees selected to officiate at the FIFA World Cup to be hosted in Qatar.

[14] Mukansanga became the first female African to officiate at the men's top football event on 22 November 2022.