More ideas from Mia
The servant even looks like Azula. It's as if she's banishing the innocent part of herself, the part of her that is imperfect and makes mistakes. This is when she truly goes insane

Again very symbolic. Maybe she sees a younger or more innocent version of Azula in this servant since they kind of look alike and she is trying to forget her past self so she banished her. She wants to focus on being the fire lord to the best degree.