During the occupation she was liaison soldier of the Armia Krajowa. Her conspiratorial pseudonym was Maryna. In her apartment at Świętokrzyska Street she organised a contact point and a hiding place for Jewish people. In August 1944 she took part in the Warsaw Uprising. During the fights Vetulani was wounded. She was treated in the hospital at Długa Street and was killed on September 2, during the German pacification of the uprising hospitals. Her son Witold also fought in the Uprising; he was wounded and imprisoned by the Nazis, but survived.