What if Lucifer and Lillith had a baby girl before they were fallen? He didn't want his baby girl growing up in a space that was evil and a cruel place. He asked Sara if she could take care of his baby and asked her to keep it a secret that she belonged to him, even form her. He didn't want people hating her for her mistakes. So that is what happened, the baby girl grew up to be the most kindest and happy angle there was. Her name was Elizabeth, Liz for short. She had long white hair, and the biggest wings any Angel has seen. She, just like everyone knew she story of Lucifer, Lilith and the apple and how he was a fallen angle, and just like everyone she believed them and believed he was evil. So when she over hears Sara talk about the similarities between her and Lucifer and that he is her father what dose she do with that information.