You really are an amazing friend! I fear most people would have given up on her.
I’m sure you know this but due to her condition, addictions and mental health she is using you for everything she can get. She will never stop doing this because it gets her what she needs to satisfy her. I’m absolutely sure she loves you but You sound like your stepping back on enabling her and that’s the way forward. Just keep giving her support but nothing else and hopefully she will be able to get the help she needs. Street Drugs and alcohol are horrible!! and mixed with mental health it became destructive to everyone around us.
I hope you can find what you are looking for and peace be with you my friend.