Starting in 1958 and well into Ruppert's career, she regularly had private lessons with Maxim Jacobsen in Frankfurt, London and Lisbon.
From 1963 till a few weeks preceding his death in 1969 she studied musical interpretation with Theodor W. Adorno, with particular focus on 12-tone works by Arnold Schoenberg, Anton Webern and Alban Berg.
Ruppert's soloist's career, which started with a debut 1965 in Florence with Alban Berg´s concerto, can be roughly divided in the time before and after 1969, when she moved to Portugal to become leader of the National Radio Orchestra (Emissora Nacional) in Lisbon.
Before 1969 she held, with enthusiastic applause and critics, concerts as a soloist with orchestra in several European cities, among which Florence, Olomouc, Bucharest, Vienna, Cairo, Munich, Frankfurt am Main and Berlin, among others, with the concerts of Felix Mendelssohn, Brahms, Beethoven, Max Bruch and, her speciality, Alban Berg.
1966-67 she held the position of concertmaster of the Symphony Orchestra of the Lake of Constance and became in 1967 the first female violinist at the Munich Philharmonic, under Rudolf Kempe.
most successful pedagogic activity would appear to have been as a teacher of master classes, having been active in several places in Germany including Frankfurt and the Beda Institute in Bitburg with the set-up of a children's string orchestra, Portugal, Cairo and, from 1983 till shortly before her death, in Brazil, mainly in Olinda (near Recife) and Brasília.
Ruppert made many recordings throughout her life including works by Anton Webern, Arnold Schönberg, Eduard Steuermann, Grażyna Bacewicz, Dmitri Shostakovich, Zbinden and Béla Bartók for the radios of Zurich, Vienna, Cologne, Baden-Baden, Milan, Madrid and Lisbon, including a recording of Alban Berg's concerto for Vienna's radio.