She entered the 2008 Summer Olympics as a holder of the qualification "(74 hits)" and final "(96)" world records which she achieved in 2006 at the World Cup event in Qingyuan. She won the qualification round, but placed second in the final, where she missed two more targets than Satu Mäkelä-Nummela of Finland. Her world records lasted to the 2012 Summer Olympics, where they were overcome by Jessica Rossi of Italy, who missed only one target in the whole competition. Štefečeková was the most successful in the silver medal shoot-off, beating Delphine Réau of France and Alessandra Perilli of San Marino. She is the first sports shooter who managed to defend her medal in the women's trap competition at the Olympic Games. Despite qualifying for the 2016 Summer Olympics, she did not compete due her maternity leave.