Hirst first appeared in the TV series The Twilight Zone in 2002 and she has a small role in X2: X-Men United[1] as The "Ice Cream Girl" in 2003.
In 2007, Hirst had a recurring role as the childlike vampire Charlotte on Spike TV's Blade: The Series with rapper Sticky Fingaz.
In 2007 Hirst played Mandy Tarr in the Lifetime movie Passion's Web[1] and Young Mary in Second Sight.
In 2008, Hirst played Makoto Konno in the English dubbed version of the award-winning Japanese anime film The Girl Who Leapt Through Time alongside Andrew Francis, for which she won a Young Artists Award in 2009.
In February 2009, she filmed Stranger With My Face with Alexz Johnson, Catherine Hicks, and Andrew Francis.