In June 2013 national team coachIgnacio Quereda selected Gallardo in the senior Spain squad for UEFA Women's Euro 2013 in Sweden, one of two reserves for established first choice goalkeeper Ainhoa Tirapu.[5] Gallardo had won her first senior international cap in a 2–2 pre-tournament friendly draw with Denmark in Vejle.[6]
She was one of Las 15, a group of players who made themselves unavailable for international selection in September 2022 due to their dissatisfaction with head coach Jorge Vilda, and among the dozen who were not involved 11 months later as Spain won the World Cup.[8][9]