Minichmayr had her first break with the Burgtheater in Vienna, where she appeared in numerous plays, including Der Reigen by Arthur Schnitzler (staged by Sven-Eric Bechtolf), Troilus and Cressida by William Shakespeare (staging by Declan Donnellan) and Der Färber und sein Zwillingsbruder by Johann Nestroy (staged by Karlheinz Hackl). She made her cinema debut in 2000 as Barbara Brecht in Jan Schütte's Abschied, playing alongside Josef Bierbichler and Monica Bleibtreu.
Minichmayr's early career began at the Burgtheater in Vienna, where she appeared in numerous performances of plays such as Der Reigen by Arthur Schnitzler, Troilus and Cressida by William Shakespeare, and Der Färber und sein Zwillingsbruder by Johann Nestroy. She entered the film industry in 2000 as Barbara Brecht in Jan Schütte's Abschied, co-starring with Josef Bierbichler and Monica Bleibtreu.