Nikki was in the couch sobbing because she now a fallen angel as alastor confort her as Charlie still trying to convince her dad Lucifer redeeming sinners is possible

Lucifer: Charlie! There’s nothing I can do look at poor Nikki over there and she was kicked out only at 9 years old Charlie! It was you're fault!

Charlie: I know dad and I feel awful for Nikki but if we just proof to heaven.

Lucifer: Charlie enough! As he yell Lucifer adopt nikki tooks Nikki to bed