Abby has only just recently turned 15. She is so young. Assuming she left willingly, I would be surprised if the novelty of her excursion has not worn off by now. Especially given that the holiday season has arrived. That is why I am unsure that she is continuing to stay gone willingly.
Think back to being that age-- we all complained about school
but two weeks into summer break we missed all of our friends and were bored out of our minds. Couldn't wait to go back in the fall. Fighting with your mother as a teen is one thing, but seeing her grieving and breaking down on national television? That's got to tug on a kid's heart strings.
It is certainly possible that despite all this Abby still remains missing of her own volition, I know that many runaway teens do so each year. But I also believe many runaway teens convince themselves that no one cares, no one misses them, no one is looking for them, etc
because they do not receive any media attention. Abby on the other hand, must know via the media (unless she is being completely isolated) that her family misses her terribly and that hundreds of people care, are looking for her, and are praying she comes home.
I am not convinced that Abby is free to come home if she wanted to. But I certainly hope she is, and that she decides to come home soon.