Born in Munich, Widmann studied with Igor Ozim in Cologne, Michèle Auclair in Boston and David Takeno in London.

She has collaborated with composers such as Pierre Boulez, Peter Eötvös, Erkki-Sven Tüür, Wolfgang Rihm, Salvatore Sciarrino, Enno Poppe and Rebecca Saunders, who have written several works especially for her.

[4] She attracted attention with her collaboration in gefaltet, a "Choreographic concert" organised by Sasha Waltz and Mark Andre, with which the International Mozarteum Foundation opened their Mozartwoche of 2012.

[5] A 2012 recording of Schubert's works for violin and piano with Alexander Lonquich received critical acclaim.

[6] With her brother and pianist Dénes Várjon she played a concert at the Rheingau Musik Festival when he was artist in residence in 2014.