What are you? would have been a better question. She wasn't a walker, and definitely not human. But he shouldn't be surprised, considering the rumor was that he was currently residing in hell, with demons and vampires and whatever else stalked the night. Even rationalising it out, he was struggling to make sense of it.
"I thought you were a damn walker," Daryl replied. That much was true. "I kill walkers." He moved his bow, to illustrate that it was his weapon of choice.