Rath was born in Montreal, Quebec, Canada. Her mother is of Indian heritage, whereas her father is of English and Austrian-Jewish descent. She has a younger brother, Jesse Rath, who is also an actor. She studied Cinema and Communications at Dawson College.
On May 16, 2020, Rath married actor Jack Cutmore-Scott at their Hollywood Hills home. She announced her pregnancy with their child on July 6, 2021.[5]