I admit, I let characters get away with not knowing Matt is Daredevil because that's a crazy idea to think about any of your friends, but thinking about somebody who's blind probably wouldn't even occur to her - Karen's seen Daredevil fight, you wouldn't assume somebody who can't see is capable of kicking somebody else perfectly in the face when they shouldn't know where that face is. But, yeah, I was half-expecting her to twig during the warehouse scene. Or to have a "I know" reaction when Matt told her at the end.