 She is a graduate of the National Theatre School of Canada, where as a student she played Gwendolen in "The Importance of Being Earnest" and Isabella in "Women Beware Women" by Thomas Middleton.McKenna has played over 40 stage roles over the course of 23 years at the Stratford Shakespeare Festival, and major ones from very early on, specializing since the 2000s in strong-willed women but also mesmerizing as an actress looking very different from one role to another.2013 was her 22nd season