In 2018, she won a gold medal in the 100 metres at the Summer Youth Olympics, clocking 11.17 seconds.

[4][5][6] Rosemary Chukwuma gained her first international experience at the 2018 Commonwealth Games in Gold Coast, Australia where she won a bronze medal behind the teams from England and Jamaica with the Nigerian 4 × 100 m relay team in 42.75 seconds.

In the summer she won a gold medal with the 4 × 100 m relay team at the 2018 African Championships in Asaba but did not start over the 200 m event.

Earlier, she won double gold at the 2018 African Youth Games in Algiers over 100 m and 200 m and thus qualified for the Summer Youth Olympics in Buenos Aires, where she won the 100 m gold medal.

Then she took part in the African Games for the first time in Rabat and reached the final of the 200 m, where she did not start.