At the age of 35, Oliveros reached the form of her life in the 2011 season. In Medellín she ran a 100 m hurdles best of 13.41 seconds on 30 April, then ran 57.43 seconds for the 400 m hurdles the following day (the third best run of her career at that point). She was twice runner-up to Brazil's Jailma de Lima at the 2011 South American Championships, first in the 400 m hurdles and then in the 400 m relay. A month later she was a 400 m hurdles finalist at the 2011 CAC Championships, coming sixth in the competition. She won the first major title of her career at the 2011 Pan American Games: running at altitude in Guadalajara, she improved her personal best by almost a second to take the 400 m hurdles gold medal in a time of 56.26 seconds. She then teamed up with Norma González, Evelis Aguilar and (400 m winner) Jennifer Padilla for the 4×400 m relay and the Colombians received the bronze medal with a Colombian national record time of 3:29.94 minutes.