Sister Marguerite started out as first grade teacher in New Jersey, USA and delighted teaching little ones, whom she loved. Later, Sister was involved in parish religious education in Amherst, Bridgewater, Dartmouth, Halifax, and Herring Cove. Her ministry also included spiritual development at Springhill Prison and participation in Diocesan Ministries including the New Beginnings Program. She ministered as Hospital Chaplain at the QEll Health Sciences Centre and was Community Leader at the Sisters of Charity Motherhouse Retirement Community, a ministry for which she is fondly remembered.

Sister began her ministry, teaching elementary school and music in New York then returned to teach in Halifax and Shad Bay. Sister Helen used her business training in the Financial and Secretarial offices at the Halifax Infirmary, Mount Saint Vincent DePaul Centre and Pax Provincial House.