She had her first appearances as a soloist at the age of ten in the Cologne Basilica St. Maria im Kapitol and in the Kölner Philharmonie, afterwards also at the Schleswig-Holstein Musik Festival and the Festspiele Mecklenburg-Vorpommern [de].

After having been taught privately or as part of international master classes until 2008, she attended the Hochschule für Musik und Tanz Köln from 2008 as a participant of the Pre-College Cologne.

[2] At the age of ten Stapf came across the title melody of Spielberg's film Schindler's List, a violin piece interpreted by Itzhak Perlman by the composer John Williams.

The exchange of several years between Stapf and Gross led to the book Spiel mir das Lied vom Leben - Judith und der Junge von Schindlers Liste by Angela Krumpen in 2011.

[5] In January 2018 she played "Nigun" by Ernest Bloch in the German Bundestag in the commemoration hour for the victims of National Socialism.