Laurie,
I don't have any sage advice for you. Just know that you have my thoughts and prayers....and I will pray for the "wayward" child as well. I can't remember how old she is, but I hope she will find some sound footing soon, and that you won't have to bear this burden for long.
I always remember that God doesn't give us more than we can bear. And you, my friend, are strong, and you will get through this.
Logan