Her intense and passionate singing style has been praised as belonging to one of Germany's best contemporary voices, a "down to earth, charismatic, warm-hearted entertainer".

In a Stuttgart music club, she met the rock band Foggy Day, who convinced Haigis to make singing a professional career.

She was a frequent guest on German TV shows with Hans-Joachim Kulenkampff, Rudi Carell, Thomas Gottschalk, Ohne Filter and others.

[4] In 1990, Haigis took a new direction by not singing exclusively in German any longer, and recorded No man's land with Tony Carey and Eric Burdon.

In 1992, she traveled to Los Angeles and Nashville to produce the album Cry Wolf, on which she collaborated with Kevin McCormick of the Melissa Etheridge Band, Barry Beckett and Nils Lofgren.

[3] In 1997, she played with Franz Benton, supported by Geiger Mani Neumann (Trio Farfarello) amongst others, the live album Dancing in the Fire at Club Bel Air in Cologne.

Back in Germany she developed her own style collaborating with "RE" and interpreted songs by Airto, Flora Purim, George Benson and Randy Crawford in her way.

[3] In 1999, she fulfilled her dream of recording an album by herself at an unusual location, far from everyday life and the big city atmosphere; she rented a beach house on the Dutch North Sea coast installing a temporary studio for the production.