Anyway, to try to be succinct in what I had wrote before but lost, I feel like JH's recent reaction to the media has a lot to do with threats from WH. His references to "our past" and "our mistakes" even though his past is the only one that has been brought up really reinforces that for me. It is a subtle threat towards her (he obviously knows things about her, and he was reminding her he knows those things lest she decide to start talking to the media or anybody while he is locked away and not in control). That would also explain the scant amount of information coming from her or the rest of the family.
I believe before he was arrested he had quite a bit of control over her, and that control is continuing. She was at least emotionally abused by him while they were together. She fears for her safety and/or that of her other children. There is also a possibility that there are other accomplices (or people who are just very loyal to WH) who are able to continue to control her and her family even though he is locked up.
I think she knows more than she is telling. I do not think she is involved at all, but I do believe she is withholding information. WH, like he did to the four kids, has managed to suck her into his web. He does that because I think he does not like going down alone. Fortunately it did not work with the 4 kids; hopefully it won't work with her, either, if that is what is happening. If and when he is held responsible for the disappearance of AJ, he is going to try to take JH down with him. He will succeed to an extent if it is discovered that she was in fact withholding important information. I do not think he is done hurting her, and he will continue to do so for as long and as much as he can.
of course, this is all just my opinion. Most or all of it could be very wrong.