Hi True North. Welcome to the board.
As an outsider (never been JW), I have observed the huge emotional toll leaving the JW can take. Especially to those who leave family behind. I have often read posters talk about residual fears of Armagedon and death. You said it all. It seems to me, that most need some kind of exit therapy, from researching on the internet and forums like this one, or professional help. You don't want them to become the "walking wounded".
As far as therapists go, you would need one who knows about JW/cult issues. I would ask Lady Lee, a respected poster on this board. I believe she is away for a week or so, but you could send her a PM. I have also found that having other non-JW read Diane Wilson's book "Awakening of a Jehovah's Witness" is very enlighening. Everything that I hear on this board, with regard to freeing family, involves patience. Sounds like you have that. Amazing has written on the freeminds site on how he got his family out.
I have a 16 year old as well, and I know how important friends are to kids that age. Is there any way to start getting her involved in outside activities so she has social contacts who aren't JW? It will make the transition easier. Eventually those JW friends are going to dump her as bad association, and it is going to hurt her like anything.
If you have lurked for a while, you may already have seen this thread. It is Jgnat's thread for newbies, and has lots of resources.
http://www.jehovahs-witness.com/9/58215/863175/post.ashx#863175
I hope that all goes well.