Reigniac Quiz -- Who is this? #Reign

My fellow Reigniacs...I am having a terrible week!  I live in a rural area and our well isn't working so we have NO WATER!  I have been in homeowner hell for the last few days but I didn't want you to go too long without a Reign fix so I leave you with this.  This actress appeared in S1 and S2 of Reign.  Who is she?  Comment below with your best guess and I will be back tomorrow with the answer!  Good luck!

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