All I have to say is that you need to pull your emotions and deal with this as a serious problem. You can help her get better, but you can't go down with her. Ultimately relationships require effort from both parties, not just one. Make her understand that she has to get clean as her contribution. Tell her you will be there for her, but not for the addiction. She has to want rehab. Tell her that it is ultimately very simple: Something is leaving her life and she has to make the decision on what it is.