Montelius grew up in
Täby, Sweden and went to school at the Eriksdalsschool. During her teenage years, she worked at a library at
Medborgarplatsen and later worked for the
Royal Dramatic Theatre and Teater Plaza. At Plaza she started a long co-operation with actor and director
Thorsten Flinck. She was a director and actress for his shows before starting to write her own work. In 2011 she was appointed artistic director for the Teater Brunnsgatan Fyra Theater, a job she took over from her mother. ==In popular culture==