Nonna Mordyukova | Gaudenzio Ferrari, ''Crucifixion'', 1513, fresco, Santa Maria delle Grazie, Varallo Sesia | Della Grazie Battery |
The turning point in her film career was her role in Grazie, zia by Salvatore Samperi.
The saving of the Annunciation of San Giovanni Valdarno by Beato Angelico (now in the Basilica of Santa Maria delle Grazie in San Giovanni Valdarno) was the most important act of restitution brought about by Siviero during the German occupation.
However, her first lead roles came with two Osman F. Seden films: Teşekkür Ederim Büyükanne (1975), an adaptation of Marino Girolami film Grazie... nonna and Delicesine (1976), an adaptation of Irving Wallace novel The Fan Club that featured Viviani with Kadir İnanır and Fikret Hakan, two prominent Turkish actors.