Initially a swimmer at elite level, Mailliard made her Olympic debut at Tokyo 2020 with top 10 finishes in the C1 200 and C2 500. She is a two-time world champion and became the first Chilean to win a gold medal at a World Cup, winning the C1 5000 in Szeged in 2020. She has studied Business Administration at Andres Bello National University and Sports Coaching at Vina del Mar University.