Cohan's major movie acting debut was the 2005 film "Casanova" as 'Sister Beatrice'.
In 2006, she starred in the sequel to "National Lampoon's Van Wilder", titled "National Lampoon's Van Wilder: The Rise of Taj" playing the role of 'Charlotte Higginson'.
Her next role was in the 2007 film "Float", followed by "Death Race 2". Cohan was then cast in Season Three of "Supernatural" as the thief 'Bela Talbot', appearing in six episodes.
Cohan is also noted for playing the recurring character 'Rose', a 500 year old vampire in "The Vampire Diaries".
Cohan was then cast in the second season of AMC's "The Walking Dead" in the recurring role of 'Maggie Greene'.
She was promoted to the main cast in Season 3.
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