Am I supposed to perform a drug intervention on my stepdaughter?

Janey has a problem with cocaine. It all started last year when her father died of a gunshot. Martin was a police officer and he died during an entrapment operation. I was deeply hurt by what happened because I lost the love of my life. Janey, Martin’s daughter from his previous marriage, was heartbroken. She was daddy’s little girl and Martin’s sudden death affected her so much. In order to cope with the loss, she abused cocaine. I’ve been trying to talk her out of it but she just won’t listen to me. She also told me that I have no right to tell her what to do because I’m not her mother. What am I supposed to do? I really want to help her.

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