McKenzie was born in Les Îles-de-la-Madeleine, Quebec. She is best known for starring roles on TV: as Reena in Charlie Jade(Space (TV channel) April 16, 2005/Sci Fi Channel June 6, 2008), and as Jenn in Naked Josh (Showcase June 1, 2004/Oxygen Channel June 4, 2004).
On stage Patricia has performed in numerous musicals including The Lion King, the French production of Chicago (musical)and Notre-Dame de Paris (The Hunchback of Notre-Dame).
Her film and television roles include Sigma,Stardom, Soul Food, Blue Murder, Bliss, Bob Gratton: Ma Vie, Student Bodies (TV series), Flowers Don't Last, The Take-Away Bride and Tout sur moi (TV Series).
She was once co-host of The Caribbean Workout on TSN (Sports Network).
In 2008, Patricia joined the cast of Les Soeurs Elliot, on TVA (TV network), filming in Montreal.
Patricia received a Gemini nomination for Best Supporting Actress in Charlie Jade in the 2006 Gemini Awards.
Naked Josh was nominated for a 2006 Monte-Carlo Television Festival Award for Best Comedy Ensemble.