How can I help my sister recover from heroin addiction?

Can you answer aleah s’s question about Addiction?:

My mom and dad got divorced, and this has been so hard on my sister. Ever since then, she’s been in a slump that she can’t get out of. She started turning to heroin, and this has not helped her at all. It just worsened her case. How can I help her recover from her addiction?

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