At this point in the series, Ella is the only member of the squad who doesn't know that Lucifer and Amenadiel are angels and Maze is a demon. Since Dan joined the knowledge train in the first half of season five, it's only right that Ella learns the truth in part two! Plus, with God hanging around on Earth now, it'd be the perfect time for her to get a pep talk from the man she regards with the utmost respect — especially after having her serial killer ex-boyfriend tell her that he sees a "darkness" within Ella. She's no doubt still shaken by the encounter, so a conversation with God would help her come to terms with her inner turmoil.