And Fisk is her thrall--she never turned him, just wrapped him around her undead pinky.

Then she meets Matt, senses the devil in him, and is intrigued...enough to want to turn him.

+if she succeeds
++if it doesn't quite stick--Matt fights off her influence and the urge to feed
++++++++if Karen or Foggy are secretly vampire hunters and get dragged into a knock-down, drag out fight for Matt's immortal soul