Additionally, Haza taught during many years in the National Conservatoire of Music, was artistic director of the National Theatre for five years, and directed the Lyric Singers of Fine Arts.
Daneben unterrichtete Haza viele Jahre am Conservatorio Nacional de Música, war fünf Jahre lang künstlerische Leiterin des Teatro Nacional und leitete die Cantantes Líricos de Bellas Artes.