Idrissi was born in Rabat in 1977. Her parents are of Berber ancestry.

Idrissi dreamed of becoming a ballerina, enrolling in ballet lessons at the age of four. At age 16, she moved to Montreal to study business management, and discovered her passion for cinema after she went with a friend to a theater competition. In 2003, she made her film debut in El Bandia, which was popular among younger audiences.