Ms. Lachance was the first - and to this day the only - female Executive Director of Development and Peace. She entered into her position in 1988, and over the next 10 years moved the organization towards becoming one of the most influential in the Church in Canada and society in general.
In her first months as Executive Director, she helped lead several Development and Peace campaigns calling for economic sanctions against South Africa in protest of apartheid. Three months after the liberation of Nelson Mandela in February 1990, she participated in the creation of the Nelson Mandela Fund, alongside Mandela himself, who had become leader of the African National Congress (ANC), and Joe Clark, who at the time was serving as Secretary of State of Foreign Affairs. The fund was created to support educational resources in South Africa.