Clube Náutico Capibaribe
Hailing from the Sertão of the Brazilian state of Pernambuco, Marques moved to the state capital Recife at the age of 11 so her older siblings could attend college. One year later, she became a swimmer for Clube Náutico Capibaribe, where she competed alongside future Olympian Joanna Maranhão. Marques change of sport occurred in 2003, when she was invited to a biathle competition held by Pernambuco's recently inaugurated modern pentathlon federation, part of the then-new Brazilian confederation's plan to spread the sport. Marques won, and was invited by confederation founder Alexandre França to become a pentathlete. Just one year after changing to modern pentathlon, with França as part of her coaching staff, Marques was Brazilian and South American champion.