Hi Believer12 - Welcome!I'm sorry about your situation with your daughter. It has to be heartbreaking.
You can't fix her, only she can do that. All you can do is set & enforce your personal boundaries and manage how you interact & react with/to her. Using some strategic communication skills can make things better for you.
She is adopted and was diagnosed with an attachment disorder at 15.. .Doesn’t share the diagnosis with us except ptsd, anxiety, and depression. . .She has been picked up for shoplifting, has done a lot of cutting, suicide threats, and has an eating disorder.
Do you know any details about her bio parents? Mental health issues, addictions, etc?
We have three biological sons. All healthy mentally and doing well. Great relationships with them. She says we favor them. . .
How are the relationships between your daughter & sons?
I would agree with your husband's choice to not lend money & thereby not reward bad behaviors.
If you do connect with her, you might consider meeting her in a public place when/as possible with current situation where you live. At least, in a public restaurant, it can be easier to leave, when she behaves badly.
The best thing you can do right now is to take care of yourself and perhaps take this time to learn some of the communication skills referenced here. Check out the large green band, towards the top of the page. Check out the "Tools" menu. A good place to start is with "Boundaries" & "Don't Invalidate" feelings. There is, also, a link there to "Workshops". In the "Workshop" area, you can find info about the SET communication technique, which is a good skill to learn, as well.
I shouldn't say this, but I hope she doesn't get pregnant by her bipolar boyfriend. That genetic & environmental mix would be tragic for a child.