"Did they harm you?" Besides the obvious taking of her powers. Yes, Sookie. Eric Northman is more worried about whether you are hurt then if you have powers.
He reaches out to pick up her wrist, pressing a kiss to the inside of it on the pretense of taking a big sniff of her. He can't smell any kind of chemical or magic on her skin (beyond what's usual for Sookie) nor does her blood smell different.
"You are still fae." It's both a statement that's meant to be reassuring to her and one that's a fact. Her blood still smells the way it always did. What ever was done to her hasn't changed what she is, just what she can do.