You were an angel and with Dean, years earlier, you'd produced a nephilim. Though, only you knew what she actually was, as, in order to protect her, you'd ripped your daughter's wings out, up on her birth. Well, only you and Castiel knew what she was.

When Jack showed up, it began affecting your daughter and she started getting her powers, which led to Dean asking you questions. He knew what she was now. He knew you'd done something to her, after all she had those strange scars on her back.

"Look, just tell me what you did to her," Dean said angrily. "Just tell me what you did to her, because I know you did something."