Lopes' debut at an international athletics competition was at the 2011 World Youth Championships, where she competed in the 200 metres. She finished last in her heat and ran a personal best time of 26.69 seconds. She did not progress to the semi-final round. She then competed at the 2012 World Junior Championships in the 100 metres. She was disqualified from her heat and therefore did not race again at the competition.