Maestre became David Casinos guide in 2002. She was guide for Casinos at the 2004 Summer Paralympics. At the time, they were dating and broke Paralympic taboo by sharing a room together in the Paralympic village. She was a guide at the 2008 Summer Paralympics in athletics for Casinos, where they won a gold medal. She competed at the 2012 Summer Paralympics as a guide. Spain's 14 strong visually impaired athletics delegation to the London Games participated in a training camp at the Center for Sports Modernization in La Rioja ahead of the Games.