Lefevre was born in Trois-Rivières, Quebec, where she was raised by an English teacher father and a psychologist mother. Her father's family is originally from France and Northern Ireland, and her maternal grandparents are Jewish. Her stepfather is a rabbi. Lefevre was raised in a non-denominational household, and identifies as Jewish. She has three sisters and speaks both English and French, though she grew up mostly speaking English. Lefevre attended Centennial Academy, a private high school, and later studied creative arts at Dawson College. She studied theater for two summers at the Walnut Hill School in Natick, Massachusetts, and began a degree in education and literature at McGill University.
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