Your efforts are to be commended. Depending on her age, circumstances, history, personality and 'wiring', she may be locked into a tight spiral unable or too afraid to 'relax' (let go). Add meth drug addiction + an addictive personality underneath and you have someone who is immovable and rigid.
Enough brain damage may have been done that she is no longer able to return to her Authentic Self. Instead remaining steadfastly fixed in her False Self. Defiant and attacking those willing to help.
Sounds like her wheel's have come off and she's careening towards the ditch.
"You can't outrun your past. The Truth always wins."
I made an attempt to help a friend about 11 yrs older than me. He'd been through two or three failed marriages, had recently moved into an old house, with stuff all about. He was smart and we had many a deep conversation about lots of things. However he was in violation of the above quote. He would get quickly agitated, short and defensive...quickly change the topic, say he needed to go, etc. whatever to end the conversation.
He'd then go have fun with his 'fun' divorced friends who evidently didn't challenge him. After a particularly rough patch, he really surprised me by admiting "my last ex did a real number on my head". I think he didn't realize that I already knew this and had for quite sometime.
Over enough time, nothing was ever "squared away" both in his house nor his garage. Then more was added. Then it dawned on me he was a hoarder. His back porch, the garage, the backyard, inside...everywhere. Furthermore, the old house he'd moved into needed some serious siding rot repaired. He had a whole shop full of tools and knew how to use them, but wasn't able to 'start'.
My last straw was his becoming increasingly 'brittle', taking on a roomate (and where would he find room??) who was a slob, and then complaining to me what a slob this guy was!? The next stage was seeing live rats indoors....
That was my I'M DONE!
He de-orbited soon after, finally ditching the roomate, and crashed into another 'ditch'. That was about 8 yrs ago. I don't miss the drama nor the craziness.
You can lead a man to Water but you can't make him Think.