Solar…
as long as you know that you can't fix her, and that she can indeed drag you into her insane world if you aren't careful, sure reach out to her.
If she wants to get clean more than she wants to get high, and she knows that her son is better off without an addicted mother than with one, she may be ready.
You closed that door for a reason, do you remember what that reason was? Whatever was going on then, is still going on now.
Detox, followed by a real long term treatment program is what I recommend. Don't bring her into your home, she will make you sorry you did. She won't want to, but she is in the grip of a thing more powerful than you can imagine. She will do anything to get that one more rock. And that anything includes stealing your stuff.
Homeopathic remedies will not fix what ails her. It may take a power greater than you can muster. Her pain is her only hope. Without a deep and abiding spiritual pain, we won't do the things we need to do to get clean. Pain alone was the motivator for me.
Never deny an addict the opportunity to suffer, it's the catalyst for change.
Take her to an na meeting, she will see herself in the people there.
Richard