Let's just say for the sake of argument that Holly was abducted for sex trafficking. I'm not saying that is what happened in this case....but let's consider the possibility.
I watched a show about this a couple months ago...and really wish I could recall the name of it. I do know this subject was featured on AMW not long ago also. In one case, the young woman was approached about a job....and met a couple in a public restaurant to discuss the details with them. She immediately got a bad feeling about the couple and told them, "I'm chilly and left my sweater in the car....I'm going to go get it, I'll be right back." When she went outside, two men grabbed her and threw her into a car and sped away. They were working with the couple inside the restaurant in the sex trade business. She was eventually allowed to call home but only to tell them she had decided to leave home because she had found a great job...and was doing fine. She was allowed to call regularly, supervised, of course. Her parents felt something was wrong at first, but as time went by, they felt more comfortable about things because she continued to call them to tell them she was ok. She did finally get free of this horrible sex ring...but it was a miracle she did.
So let's say something like this is going on with Holly. We know she was taken...but what if she has called her family and said, "I'm ok...everything is fine," but they know that is not true. They are trying to keep in contact with her until they can find her...or whoever is holding her. The parents aren't talking because they want to keep this contact with her...and LE is not saying much because they know she is alive, and they simply need to locate her. If the family or LE talks too much publicly, maybe they are fearful that her abductors would kill her....so they are silent, while searching for Holly's location.
This story may sound ridiculous...but I'm running out of scenarios.