"I said hands up," Alex repeated sternly, and narrowing in turn, "And I'm not the one who just broke in here, so lets keep the focus on you. Who are you?" If Fury had sent her she wouldn't be looking at him like he was lost. She was the intruder here, not him.
"You don't have clearance to be here." That much at least he had confidence in. Anyone who was supposed to know about this place or about the Secret Warriors would have updated security codes, so either she was entirely out of date and not someone Fury trusted enough to let in on them, or she was working for the other side.