She was also the female vocalist for Austrian band Siegfried and Eyes of Eden with Polish heavy metal musician Waldemar Sorychta.
In 1994, Schleret and Martina Hornbacher replaced the former vocalists and released their first demo tape with Dreams of Sanity in May that same year.
The band went onwards making their second album Masquerade, released in 1999, with Schleret as the lead vocalist (excluding the track "The Phantom of the Opera" which featured Tilo Wolff of Lacrimosa), and The Game in 2000.
After The Game was released, the band went through some unstable times in which some line-up changes were made and even though work on the following album began.
She worked with Serenity on studio and live versions of the track "Fairytales" from their 2008 album Fallen Sanctuary.