So both JA's mom and RB's sister have said they thought it could be Bella. I assume neither had contact with Rachelle otherwise surely one of them would have asked questions.
I think Rachelle distanced herself from everyone she was once close to, all in the pursuit of her new man and their drug habits. She isn't friends on FB with any other Bonds or anyone with JA's surname. And this is why they've been able to cover it til now, everyone they currently associate with is a transient acquaintance, it would be easy (and commonplace in those circles) to say Bella was in care.
Still, the mind boggles why not one person called it in. Not one family member, friend of even FB friend thought it was worth a phone call. So, so sad.