She was selected by the International Olympic Committee (IOC) to compete for the Refugee Olympic Team in the women's 800 m at the 2016 Summer Olympics in Rio de Janeiro, Brazil. The Refugee Olympic Team was the first in Olympic history. Lokonyen was one of five athletes on the refugee team born in South Sudan and was the team's flag bearer at the opening ceremony. Nathinke finished seventh in her first round heat with a time of 2:16.64. She did not advance. She also competed in the 2020 Tokyo olympics.