I hate to say it but my first thought (before knowing exactly who the family member was) was that the person who dropped her off Saturday may have been responsible. I never heard that it was verified through anything but the family member reporting that she made into the house safely.
If they were responsible (speculation still at this point), I wonder the circumstances. I don’t feel that a disappearance/ransom was the original intent. My thought was there was a conversation or request for money that didn’t go the way that they had hoped. Anger ensued and the situation took an ugly turn. After that, things were staged to look like an abduction and cameras removed. jMO. I definitely feel something seems off with the circumstances. I mean why wait an hour to call police when the front door looked like it did. My immediate thought would be to call police as soon as I saw all that. I hate to speculate on family members but this case is such a one off, it doesn’t seem random.