If her connection with her parents death, was the mafia. Older then Chūya/Dazai/few of the recruitment of members in the future mafia.
Did she escape too? Kinda depends. Like Dazai has to or any reason to run like Oda's dying wish. She is an Executive? Then she's their Senpai. Ane-San her mentor to help also Chūya Gravity Manipulation. Another big sister, or Ane-San is the Godmother of the few mafia. I think it's possible for many to fall as equally been taught grace and beauty. Most of her choices of clothing was given to her, she doesn't care. An on going ability to act like android it enforced into her mind if she leaves. Apprentice/assistants need to repeat mission objectives.

"The Lady of the Hour"
"The Soul of Crushed Dreams"
"The Enchantress"

Me/Personal opinion about this: I just wanted to meet Oda.