Beatrice's idea of keeping her company was feeding her tales and adventures of Marcel. Unfortunately, those stories were not useful to her because they were mostly about Marcel when he was younger. Arianna needed real shit on him, not child's stuff.
However, the tales were quite interesting and she found herself curious for more, like why the father and son hated each other. She heard rumors that Marcel's father had been abusive, she just needed more information. Since she has literally nothing to do in this place, Arianna has grown addicted to gathering information and was on her way to becoming a reporter.
Well, that doesn't sound like a bad career since she'd get to expose crime families like the Luciano's - if they don't kill her first. Yeah, hurray - note the sarcasm. She better figure out what to do with her life once she gets out of here - hopefully.