[1] In 2000, Fox made her debut for the Glyndebourne Festival as Karolka (Jenufa), returning in 2002 as Zerlina (Don Giovanni) and in 2003 as Susanna (Le nozze di Figaro).
Of her Susanna in Le Nozze di Figaro at the Glyndebourne Festival Barbarina Diana, writing in Il giornale della musica described her performance at Glyndebourne as "a delight for the eye and heart, whose voice, fresh and crystal clear is blessed with a rare beauty accompanied by a strong musicality: 'Deh vieni' interpreted without affectation, directed to her beloved, takes your breath away".
In 2007 she sang Zerlina (Don Giovanni) and Woglinde (Das Rheingold and Götterdämmerung; in 2008, Lucy Lockitt in The Beggars Opera and in 2009, Asteria in Handel's "Tamerlano."
She is scheduled to revive the role opposite Plácido Domingo at the Gran Teatre del Liceu in Barcelona in 2011.
In 2004, Fox made her North American debut as Zerlina (Don Giovanni) at the Cincinnati Opera.