[3] She then bettered it as she ran 12.71 for the 100m hurdles on 24 July 2019, at the Motonet Grand Prix in Joensuu, Finland to set a new junior world record.

[6] In the semifinals of the 100 m hurdles at the 2020 Summer Olympics, she set a new personal best of 12.40, defeating Kendra Harrison.

Anderson finished fourth in the 2022 World Indoor Athletics Championships in the 60m hurdles.

At the 2022 World Athletics Championships in Eugene, Oregon Anderson won her heat to qualify for the semi-finals as the fourth fastest overall before winning the silver medal in the final.

On her comeback she's clocked 13.34 seconds to win at the La Fratellanza 1874 meeting in Italy on 26 April 2024.