In 1990, Breuel was elected to the Executive Board of the Treuhand, a year later she became the successor of the assassinated Detlev Karsten Rohwedder.
In 1990, Breuel was elected to the Executive Board of the Treuhand-a holding firm responsible for the sale of GDR state assets. A year later she became the successor of Detlev Karsten Rohwedder.