In 1940 she began to study under Enrique Casal Chapí, the director of the Orquesta Sinfónica Nacional (OSN) in the Dominican Republic.

As director, Casal Chapí often championed native composers and performed their works with the symphony, and Lapeiretta de Brouwer earned exposure both in the Dominican Republic and abroad.

In 1944, her string quartet piece Suite Arcaica was performed at a BBC concert in London[3] commemorating the centennial of Dominican independence.

[4] Lapeiretta de Brouwer also composed several ballet scores including La reina del Caribe (The Queen of the Caribbean).

The Orquesta Ars Nova in Santiago dedicated their full 2004 concert season to her memory, praising her as an important, but often forgotten, part of classical music in the Dominican Republic.