Hi itgeek,
Sorry for the late reply. What I mean by too familiar is that she is now so familiar with the way you are, how you react, what you may do and so on. Nothing you can probably say to her will jump start her into action and so her only option is to try and eliminate her addictions and stabilise her mental health issues.
As far as residential treatment I can really say who could provide it but I would absolutely insist that her mental health team prioritise her addictions.
I do hope you can help her because she sounds like a good friend.
Please let me know how you get on and good luck.