Who art thou? — This is not a question of doubting, but of wonder, as if she had said, Art thou in very deed my daughter? I can hardly believe it. How camest thou hither in this manner, and thus early?
Related Commentaries of Ruth 3:16
Ruth 3:16
16 And when she came to her mother in law, she said, Who art thou, my daughter? And she told her all that the man had done to her.