Gumenick was born in Hudiksvall, Sweden, the daughter of a Russian father and Polish mother. She graduated from the University of California, Santa Barbara in 2008, earning a BFA in theatre with an emphasis in acting.
Gumenick's first role was in a short film entitled Sayonara Elviko, before she moved on to Army Wives. She then starred in a series of webisodes for the television show My Own Worst Enemy, before being cast as the young Mary Campbell, who became Mary Winchester, on Supernatural.
She then had roles on How I Met Your Mother, Grey's Anatomy, Ghost Whisperer and Bones before being cast as Natalee Holloway in the Lifetime movie Natalee Holloway. She also appeared in the movie's 2011 sequel, Justice for Natalee Holloway.
She subsequently appeared in episodes of Castle, No Ordinary Family, The Glades, The Closer, Grimm, CSI: Miami, CSI: NY and Rules of Engagement.
In 2014, she began playing the recurring character Philomena on the AMC series Turn: Washington's Spies. In August 2014, it was announced that she had been cast as Carrie Cutter / Cupid on The CW series Arrow. (Source: Wikipedia)