Jaffé was born in Montreal into a family of musicians and was fascinated by classical music from a young age. She completed her Bachelor's degree in violin performance at the Université de Montréal and continued her studies in Berlin, Germany with a Master's program at the Hanns Eisler Hochschüle für Musik. She later co-founded the Alaya String Quartet and she also co-founded the Alondra String Quartet. In 2013, co-founded the Rosebud String Quartet, with whom she currently performs regularly. In 2015, Jaffé joined the Canadian Opera Company as a violist and she has also recently been appointed as principal viola of the National Ballet of Canada Orchestra. Her first album with Welsh pianist Huw Watkins will be released in 2022.