I've thought for a while now that Mollie left voluntarily with someone she knew and trusted and that at some point it turned out bad. Perhaps the person had other ideas. I have felt like her dad has also felt this for awhile due to his comments, like "just come home, be okay."
I felt this comment he made on a Today show video made it sound like they had a better idea of what went down than they are sharing with the public.
He said, " we sorta know what general timeline, we sorta know where it took place, we know what has happened, there is no why, it makes no sense."
Here's that video interview where he made the comment above.
Twitter