Has she tried AA? Maybe pick up some AA literature and either give it to her or leave it out where she can see it. When I was addicted to crack for four years my psychiatrist had me go to a meeting early on in my addiction. I didn’t get clean right then but at least I learned what meetings are like.
I got clean on a fluke. I was smoking crack heavily at every chance I got and one day I was at my dads house watching TV while he was at work. A commercial came on about getting help for drugs abuse and it gave a phone number. On a whim I called the number and it was a recording for CA (Cocaine Anonymous). It gave several locations for meetings near me.
I went to the first one and during the whole meeting I thought everybody in there hated me. But after the meeting several people walked up and shook my hand and they were really friendly. So I went back the next week and I started going to a couple other meetings. Unfortunately I was still using in between meetings. But as they say in the program, a seed had been planted and I had a taste of what a 12-step program was like and I had a good impression of them. I didn’t get clean for another year but in 1990 I lived in a group home that held a meeting once a week in the kitchen. The people in the meeting were cool and friendly and nice and it kept me going and now 31 years later I haven’t touched alcohol or drugs since Jan 1st, 1990.
Tell your sister she’s killing herself with alcohol and that AA works and they want to help her. It’s free and nobody wants anything from her except to help her