She joined John Clark for two years as the child co-host of his Junior Magazine series for CBC Television.
She debuted on Broadway in The Prime of Miss Jean Brodie in 1968, going on to five more plays with the Tyrone Guthrie Theatre in Minneapolis, Minnesota.
In 1974, she was back on Broadway playing the role of Jill in Equus, which starred Anthony Hopkins and Peter Firth.
[5] Maxwell has also appeared in several noteworthy films including Rich Kids (1979), Popeye and The Changeling (both 1980), Psycho III (1986), Philadelphia (1993), Dead Man Walking (1995) and Brokeback Mountain (2005).
Her performance in the 1998 independent Canadian dramady Last Night garnered Maxwell a nomination for a Genie Award for Best Actress in a Supporting Role.