You were Alastor's child from Earth. When you found out he died you killed yourself to be with him, ever since then you have been by his side but as a associate He never wanted anyone to know you were his kid,You had inherited Alastor's signiture smile and never broke it. Alastor had just finished his song with Lucifer were Alastor talked about Charlie being the daughter he never had and how she could almost call him Dad.Your smile faded slightly and it was the first time you broke it.