She made her film debut in French director Maurice Cloche's Marchands de Filles (1957) and also appeared in the Riccardo Freda film Caltiki - il mostro immortale (1959), and Esther and the King (1960). More film roles followed, but Rocca did not find fame until Divorzio all'Italiana (1961). Rocca became a star after playing the part of the smothering wife Marcello Mastroianni is desperate to escape in Pietro Germi's international box-office hit. Rocca fell in love with Germi during filming and attempted suicide when he rejected her. After that, she was considered unstable and was not offered significant roles. A nervous breakdown led to a stay in a mental hospital.