She graduated from Mount Saint Vincent University in 1988 with a bachelor of arts in modern languages.

DiCostanzo worked for Nova Scotia Interpreting Services and also has experience in banking administration, travel constituency, entrepreneurship and business ownership.

DiCostanzo speaks five different languages and has worked as an interpreter for new immigrants and refugees for almost 30 years.

DiCostanzo is a member of the Public Accounts, Internal Affairs and Law Amendments Committees.

[4] As of September 22, 2024, she serves as the Official Opposition critic for Immigration, the Office of Mental Health and Addictions, and Seniors & Long Term Care.