She didn't answer, because she thought she wasn't expected to. Sometimes she answered when she shouldn't, usually when the people were yet unknown to her. John was like no one else she'd met before, and she was still learning about him.
"Where is your home?" she asked instead. She wondered what he was - not human, because that was clear, but what he really was inside himself. This was a question she couldn't ask, and not just because English was so frail. What he believed himself to be did not necessarily match with what he truly was.
It would be one more thing to learn about him, if she had the chance.