She made her professional debut in her native city on 26 December 1820, singing Ippolito in Simon Mayr's Fedra.
[1] On 12 March 1822 she portrayed Azema in the premiere of Giacomo Meyerbeer's L'esule di Granata at La Scala.
Her debut in Naples was on 29 September 1824 at the Teatro di San Carlo in the premiere of Giovanni Pacini's Alessandro nelle Indie.
She returned to that house later that season to sing Pamira in Gioachino Rossini's Le siège de Corinthe.
[5] Tosi was married to Count Ferdinando Lucchesi Palli and had two children with him: daughter Clotilde and son Febo Edoardo.