[3] In 1982, Hallier appeared in a short-run Showtime soap opera entitled Love at the Crossroads, opposite George Touliatos, Eve Crawford, and Vivian Reis, in which she portrays Michelle, a starlet attempting to make it in Hollywood.

"[6] The following year, she appeared in two episodes of the Canadian series Loving Friends and Perfect Couples, after which she relocated to Los Angeles, California, to pursue further work in television.

After appearing in the television movies Leona Helmsley: The Queen of Mean and A Woman Scorned: The Betty Broderick Story, Hallier would become associated with supernatural and science fiction through her work on series such as Star Trek: Voyager[7] and Poltergeist: The Legacy in 1997.

[8] The following year, she starred in the popular Canadian program Strange Days at Blake Holsey High,[1] followed by a supporting role in the Western Monte Walsh (2003), opposite Tom Selleck and Isabella Rossellini.

[9] In 2008, she appeared in a supporting role in the Canadian-produced miniseries The Summitt, opposite Bruce Greenwood, Christopher Plummer, and Wendy Crewson.

[10] In 2017, Hallier portrayed Alice in the Netflix comedy film Christmas Inheritance, opposite Eliza Taylor, Jake Lacy, and Andie MacDowell.