Bryn began acting as a child, initially onscreen in various Canadian feature films, alongside other young Canadian actors Michael Cera and Allison Pill.
She lives in Toronto, Ontario, Canada. McAuley graduated from Vaughan Road Academy alongside other performers like Drake and Sarah Gadon. In 2010, she co-founded the Young Emerging Actors Assembly, YEAA, with Eli Goree. YEAA is the youth committee at ACTRA Toronto, representing actors who play 17-30 in Toronto.
Bryn's official website is www.deadseriousactress.com
Her acting career began when she was invited to try out for some roles when she was four, after an unexpectedly brilliant performance she was accepted into an agency and began to land several roles. However she established her role as a voice actor after landing the role of Caillou in 1997. She has since received several other prominent roles such as Gina Lash on Angela Anaconda, Becky Lopez on George Shrinks and Laney Penn on Grojband. She has stated that two of her favorite roles are Quills in Numb Chucks and twin cheerleaders Amy and Samey in Total Drama: Pahkitew Island'.
In February 2013, McAuley performed in a hit play called Claire from the Bus, written and directed by Kjartan Hewitt.