I think she's dead, and I think they know it. I'm not saying they're directly responsible, but I'm certain they and their little gang know a lot more than they're telling.
I'm with AYG and Cazzz. They are highly intelligent, articulate people with a healthy income. It takes no stretch of the imagination to see how easily they could afford publicist who'll show them how to manipulate the media to their own ends.
Get the media on side, stick to your story (when you've finally decided what that's going to be) and then become 'convinced' that your child is still alive.
I hope with all my heart that the child is alive, but I'm having a difficult time believing that to be true.