She showing all signs of a drug abuse

All you can do is throw her a rope by saying if she ever wants to get her life together you will be there for her. You will not be able to make her change. Talk to her, comfort her, but do not enable her. Do not let yourself be used or tricked into enabling her habit. Do not drive her anywhere but home, do not lend her money, do not do her any favors that put you at any risk at all. Above all do not trust her; addicts are infamous for stealing from all and sundry to feed their habits. Just be there to support her emotionally, and hope she figures out the dangerous ground she is on.

I had a sister who used to do drugs. It took her years to figure out it was bad news. In the meantime my parents spent a fortune on treatments for her, and it ruined my father's career. To this day (20 years later) she resents them for it, even though she now admits it was bad for her. In the end you may have to just let her go in order to protect your own sanity.

I am sorry for your situation. It is difficult to watch a friend destroy his/herself. The powerless feeling really sucks. But that is all you can really do until we finally figure out how to get the orbital mind control lasers away from the government.

Be safe.

Let me tell you something. Even if your friend was told she had one day to live if she didn't give up, if she didn't truly want to, she wouldn't. I know it's hard to hear because you only want the best for her and it's hard for you to watch this but this isn't your responsibility. Trust her judgement. If you really really want to help her, I suggest this. Write everything you feel on paper. Write it to her. From the heart. Don't accuse her of anything, don't judge her. If you don't have any evidence then don't accuse her. Just tell her what you've seen, what you FEEL, what you THINK. Tell her that you will always always be there for her no matter what, and that this will be the last time you will bring it up. Give the letter to her. And then leave it. I promise if she needs to she'll come to you. Sweetie, you can't make her do anything. If the idea if a letter doesn't feel right for you then message her or email it. I suggest this because she'll have time to digest it, read it again, go back to it, and remember it and it will really move her. Good luck!