This article from TVLIne (by Matt Webb Mitovich) also talks about of the role of Laura in the two final episodes of Haven (will air, Friday December 14 and Friday December 21 at 10PM ET/PT on Syfy).
"Will Supergirl raise hell on Haven?
Smallville alum Laura Vandervoort kicks off her two-episode arc this Friday, starting with Season 3′s penultimate episode, and this much viewers have gleaned about her heretofore top-secret role: She is playing Arla, the wife of James Cogan (aka The Colorado Kid) — a neat trick since sooo many years have passed and she looks… well, like a twentysomething Laura Vandervoort. The actress describes Arla as someone who is “out for vengeance” yet is also “a true romantic who has been hurt.” The stone-cold revenge-seeker in her, though, promises to show fans “someone they haven’t seen me play before,” she raves. (I’ve seen this run’s final two hours, and Arla plays a pivotal role in some wiiiild stuff that goes down, as Audrey debates her fate/date with The Barn.)"
Full article: LINK