She took the gold medal the World Junior Championships in 2000. At the 2006 World Indoor Championships she won her first major international senior medal when she finished third with 6.76 metres - the same result as the silver medalist Naide Gomes. Gomes beat Montaner on countback, due to a longer next best jump. In 2007 Montaner won the silver medal at the European Indoor Championships, behind Gomes.