The gold medal in the 2007 Pan American Games, held in Rio de Janeiro, qualified Marques for her Olympian debut at the 2008 Summer Olympics, where she finished 18th overall. The following year, Marques joined the Brazilian Army to gain the scholarship and training facilities reserved for military sportspeople. Marques wound up topping the Brazilian pentathlon rankings in 2010, and became 3rd in the world in 2011, where she was a silver medalist at the Pan American Games and three medals at the Military World Games.