 Her mother made her debut at the Theater an der Wien on 4 June 1803 as Cora in the tragedy "Die Spanier in Peru oder Rollas Tod" by August von Kotzebue.Louise Müller first appeared on 15 June 1803 as Caroline ("Blumenmädchen auf der Insel") in the musical play "Die Insel der Liebe" by Vicente Martín y Soler in the German translation by Matthäus Stegmayer.The placard contains the note