In 1990 Amedeo Minghi, with his talent as a scout, sang a duet with her in Vattene amore, the song that won third place in the SanRemo Festival and has been interpreted into English 'All for the Love' by Nikka Costa.

Mietta returned to The SanRemo Festival in 1991 with Dubbi no, sung in English by Leo Sayer, and won another Telegatto as the female artist of the year.

In 1996, she performed the speaking and singing voice of Esmeralda in the Italian-Language dub of The Hunchback of Notre Dame, but was later replaced by Franca D'Amato in the less successful 2002 direct-to-video sequel.

In 2004 she took a duet with Morris Albert in SanRemo Festival with Cuore and in 2005 she participated in a talent show conducted by Simona Ventura, titled Music Farm.

In 2008 Mietta celebrated her 20th anniversary as an artist, returning for the 8th time at the Sanremo Music Festival with Baciami adesso, a song included in the album Con il sole nelle mani.

In the same year she debuted as a novelist with her first novel about women,"L'albero delle giuggiole", and narrated the audiobook "L'ultimo elfo", a fantasy written by Silvana De Mari.