My sister went through the same thing. She started doing Ice everyone in a while, and then it turned into when she woke up in the morning to doing it in the bathroom at our grandmothers funeral. It is really hard to see that. But I do agree that it is one of those things where they have to realize they have a problem. And it's true that once they are so far into it... they get everything they need (place to live, rides, free drugs) cause they have made the connections. She got in with the major drug dealers and I wouldn't doubt she's had sex for free drugs. It is really a horrible thing to get caught up in. My sister ended up getting pregnant by one of these "drug dealers" and she is gonna have the baby... and guess what... he's not around anymore. She is now off of drugs as far as I know... I think she may still be smoking pot, but there is no doubt in my mind that she will go straight back to the harsher stuff one day. I am in the same situation as you and it sucks. It hurts to feel used by someone that you are related to. My sister would be nice to me until she got what she wanted... after she got all she could she suddenly hated me and treated me like shit. I really don't know what to tell you. My sister has done everything yours has, and I have just come to the conclusion that you just need to keep telling her that you are there for her. That you love her. Tell her how you really feel, she might not like it but one day she will listen to you. One day she will hear you. This is something she has got to do herself unfortunately, but she's gonna need to know that she is cared for by her family. That when she does come down one day that she still has a family. She doesn't need to think her family hates her... I think it will just push her further.

On a side note... After telling my sister how I really felt about her problem... She cussed me out, told me she hated me, told me she never wanted anything to do with me ever again... I told her I understood how she felt and it was ok... Even though it was a week later she called me and told me that she was sorry and she has really been doing better since.