Speak Up

I'm 21 years old and my cousin is 22 she is a meth addict. She grew up in an abusive household as a child and was raped by someone close to her for the majority of her childhood. She was constantly told she was stupid, deserved what happened to her, wouldn't amount to anything, and then at 16 she got out. She came to live with my family; she was safe. When she was 16 her mother passed away from cancer she was devastated (her mother was a good woman). She left our home at age 18, she went back to the people who were abusing her. My mother was furious and refused to let her have any contact with me. I recently have got in touch with her. She has two kids who are not in her custody and has left the father of the children.My mom and I met with her today and she said she needed help. She tells me she wants to get away from the drug, but I cant help feeling she is telling me what I want to hear. She does not want to go to a support group. My mom has asked her and her boyfriend to move in with her, they have agreed. They both say they want to quit. My mom still has my younger brother at her house and takes care of my sisters three year old. I want to help my cousin I miss her so much, but from other peoples stories it seems as if she and her boyfriend are to much of a danger to my family. My cousin kept telling my mom and I she hits people for fun, enjoys manipulating people, pulls knifes, lies to cops, thinks people are trying to kill her. She is honest about using and I only contacted her yesterday, she uses every day. She is nothing like the kind hearted, goofy, loving, and sincere person I used to know. Will she ever be the same? Please don't tell me to pray for her, because she does not need prayers she needs real human contact and love. What can I do to help her? She is depressed and is cutting herself there is so much wrong and nothing I can do, but wait for her to help herself.