[1][2] At the 2012 Summer Olympics she beat Anne-Caroline Graffe of France in a 9–7 win, becoming the first gold medalist for independent Serbia.

[3][4] At the 2016 Summer Olympics she was eliminated in quarterfinals by British Bianca Walkden.

At 2017 World Taekwondo Championships she won gold medal, beating South Korean Oh Hye-ri.

[6] At the 2020 Summer Olympics, which were held one year later due to COVID-19 pandemic, she won her second gold medal (first for Serbia in Tokyo 2020) against South Korean Lee Da-bin.

[7][8] Mandić and her trainer Dragan Jović were inducted in the Taekwondo Hall of Fame at the 2013 Ceremony in Las Vegas.