Thanks so much to everyone who replied. I appreciate everything that was said.
I particularly appreciate the perspective that addicts can really be crafty, even with trained personnel. I guess that makes me feel a little less of a fool.
Thanks also for the advice about boundaries. I've told my niece that she can't live here. After lying to me so long, there is no trust left and I won't have someone I don't trust in my house. Not to mention the criminal element she calls friends that she brings by when she lives here.
My husband's position is that he doesn't want to even see her until she's at step 9...
And - I am now seeing that she is to me what meth is to her - she's a very clever girl and I'm no match for her when she's actively using so, just like any other addict, I feel like I need full abstinance until she's in active recovery.
thanks agian all... you're the best!