my situations pretty shit right now and I need advice on whether

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my situations pretty shit right now and I need advice on whether or not to do a (potentially shitty) thing

>sister is 22 this year
>since she was 13 has been getting involved with drugs and gangs
>my entire teenage years were ruined by her being a dickhead and my mum having to deal with all of it meant I was alone nearly all the time
>developed severe depression and anxiety and tried to kill myself a lot
>she's dating a drug dealer now, he's potentially going to jail as he's recently been arrested
>she dropped out of high school
>no job
>not even trying to get one
>has been given opportunities to study (for free once a week) and better herself
>she agreed but never went to class
>basically an all round degenerate with no hope
>she gets worse and worse with every year that passes
>she also has anger issues and becomes very violent and nearly got us kicked out and homeless
>insults my mum about her disability and mental health
>mum is too scared/tired to do anything about it anymore since she's basically tried everything.

Everything hurts and I don't know what to do.
I've been thinking a lot about going to the police about her for two reasons:
- it will get her out of our lives at least temporarily
- it's the only thing that will make her wake up
But I don't know if I could live with myself knowing I did that, especially since I would have to do it anonymously.
Please tell me what you would do in my situation.