In 2005, she was the 100 m hurdles runner-up at the South American Championships, where she was fourth in the longer race. In her third consecutive appearance at the 2005 Bolivarian Games, she missed out on defending her hurdles titles as fellow Colombian Brigith Merlano beat her in the 100 m final while Ecuador's Lucy Jaramillo edged her into second place in the 400 m hurdles. Oliveros had a trio of fifth places in the hurdles and relay events at the 2006 CAC Games. She was fifth again in the 400 m at the 2006 South American Championships, although she left that competition with a silver medal from the 4×400 m relay.