Arianna had been careful all her life trying not to be caught breaking the law. It was hard growing up innocently when you have no one to look after you. She worked for Ruth because the pay was attractive and supported her survival.
But she had to give up working there in the end because when you begin associating with criminals, you start to think like them as well. And that proved effective after she picked up the skill of pickpocketing.
It seemed cool at first, being able to snatch stuff from people without them noticing. But that was not the kind of life Arianna wanted, especially when she saw the lives of the people she treated. Those criminals had a bleak future.
She was privileged to know some of them, especially the lower gangs - most of the important figures wore masks to protect their identities and hardly spoke to her. She guessed they looked down at her or simply didn't care.