March is a " first generation Canadian ." Her parents came from Poland and were among the ten percent who had survived the Siberian gulags during the Second World War.
March studied at the University of Windsor and reached a BFA in acting. As an actress, she was immediately accepted and spent three seasons long the Canadian Stratford Shakespeare Festival. From 1980 to 1985 she appeared in major theaters across Canada, where she played roles such as Desdemona in Othello, Jenny in Neil Simon's Chapter Two, Ruth in Harold Pinter's The Homecoming and Joanna in Noël Coward's Present Laughter. In 1984 she was nominated for a Genie Award for Best Actress for her role in the film Val Deserters.
1985 March played Isabella in William Shakespeare's Measure for Measure and Maria in Twelfth Night for the CBC television. In 1986, she moved to New York City and appeared in the Broadway. In 1989 she was invited by Michael Kahn in the Guthrie Theatre in Minneapolis to play the title role in Webster's The Duchess of Amalfi. She then moved with her family to Los Angeles, where she Lursa the role of Duras in the television series Star Trek: The Next Generation (1991-1994) and Star Trek: Deep Space Nine ( 1993) and in Star Trek: generations ( 1994) took over.
March is married to actor Alan Scarfe since August 1979. Both played together in several plays and movies Deserters (1983 ), Kingsgate (1989 ) and The Portrait (1992 ) and had appearances in the television series In the Heat of the Night (1987) and Star Trek: The Next Generation. Together they have a daughter.