In 2003, she reached her breakthrough season by finishing fourth in the women's race at the Berlin Marathon, with her best career time of 2:28:49, twenty-one seconds behind Italy's Ornella Ferrara.

At the 2004 Summer Olympics in Athens, Dias placed sixty-second out of eighty-two qualified runners, including Great Britain's Paula Radcliffe in the women's marathon, outside her personal best time of 2:28.:49.

The following year, she displayed a better performance with a thirty-second-place finish in the same event at the IAAF World Championships in Helsinki, Finland, posting her time at 2:36:50.

[5] In 2009, Dias achieved her best career result in the long-distance running, when she finished fourth in the women's 10,000 metres at the European Cup in Ribeira Brava, Madeira, clocking at 31:42.94.

[6] Three years later, Dias sought to qualify for her fifth Olympics in London, with a higher chance of competing at the 2012 European Championships in Helsinki, Finland.