[3] International performances include Richard Strauss's Four Last Songs with the English National Ballet at Sadler's Wells, Meleagro in Atalanta in the London Handel Festival, Justice in The First Commandment with the Classical Opera Company, Das erste Blumenmädchen in Parsifal, Marzelline in Fidelio, with the Auckland Philharmonia and New Zealand Opera, and Musetta in La Boheme with Longborough Festival Opera.

Pierard sang Sandman in Hänsel und Gretel, High Priestess in Aida and Noémie in Cendrillon, all with The Royal Opera.

[4][2][5] She has appeared with Kiri Te Kanawa and Jonathan Lemalu, and performed a number of oratorios, including Carmina Burana, Mozart's Requiem and Haydn's Nelson Mass as St Martin-in-the-Fields under Ivor Setterfield, Verdi's Requiem with the Cleveland Philharmonic Orchestra, Haydn's The Creation in the King's Lynn Festival and Vaughan William's Dona Nobis Pacem and Karl Jenkins' The Armed Man at The Royal Festival Hall.

[6][5][7] New Zealand performances include the female lead in Purcell's Dido and Aeneas with the Christchurch Symphony Orchestra in 2023, and Brahms' Lieder with Michael Houstoun in the Hawke’s Bay Festival.

Pierard won the Lexus Song Quest in 2005, the Dame Malvina Major Foundation's Mina Foley Award in 2014, the Lies Askonas and the Royal Overseas League Prize, and was a Jette Parker Young Artist at the Royal Opera, Covent Garden.