She studied at Victoria University of Wellington and the New Zealand School of Music, followed by a master's degree in composition and theory at New York University's Steinhardt School of Culture, Education, and Human Development.

Peacocke is a doctoral student in composition at Princeton University and holds the Mark Nelson Ph.D.

[3] Peacocke formerly managed and taught with the New York Philharmonic Very Young Composers program.

Peacocke's music combines acoustic instruments and voices with electronics, and her work often has a sociopolitical focus.

[5] Peacocke also collaborates with directors, filmmakers and choreographers to write music for theatre, film and dance performances.