Born in Flint, MI, Kirstie has been acting since she was a teenager, getting her start in the Flint Youth Theatre, where she met her first mentor, Bill Schwerin. She appeared in several feature films in Michigan before moving to Los Angeles in 2013 where she has continued her work and training as an actress. Kirstie is trained in Meisner, having completed Alex Taylor's program at the Taylor Acting Studio.
Her older half sister Keri, found her on Facebook in (2016). They have the same biological father, who died of Pneumonia shortly after Kirstie was born.