Okay i know this might be a big stretch but hear me out, so in this scene they showed us 3 people (quinn and dawe, bella, and josy) so i was reading again what the mc said "things you don't want anyone else to see" and it got me thinking that maybe in this room that nobody knows about in bella's house is a big secret that bella's hiding.
She keeps feeling guilty about her husband and she never mentioned where he went or where he is, she just wishes he comes back all the time. So i'm worried that maybe she has done smth to her husband by accident and he died or smth because of it and she was scared to tell anyone because she might take the blame through the process and get a life sentence in prison, and she didn't wanna believe that he was dead so she hid his body and believed that she had nothing to do with it and that he just abandoned her and left, and eventually it caused her to become mentally ill. but that's just me trying to come up with an explanation.