Lemos Silva began the 2011 in good form, clocking 11.19 seconds and 23.09 seconds for the 100 and 200 m early in the year. At the 2011 South American Championships in Athletics she won her first continental titles by defeating all comers in the 100 m and 200 m races, and was also a runner-up in the relay. At the 2011 Military World Games in Rio de Janeiro she won three medals for Brazil: she set games records to win the 200 m and relay titles, but was narrowly beaten in the 100 m final by Ukraine's Mariya Ryemyen. She improved her 200 m best sixth tenths of a second at the 2011 Brazilian championships to set a South American record of 22.48 seconds breaking Lucimar de Moura's record, en route to retaining her national sprint titles. At the 2011 World Championships in Athletics she was a semi-finalist in both individual sprints and in the relay she helped the team to a Brazilian record of 42.92 seconds in the heats and placed seventh in the final. Medals came at the 2011 Pan American Games, where she was fourth in the 100 m but won golds in the 200 m and relay events. In the relay, she led off a team including Vanda Gomes, Franciela Krasucki, and Rosângela Santos to break the national record yet again, crossing the line with 42.85 seconds.