What do you think of me turning my sister in to the police?
Why do you want to turn your sister into the police?
She's in a lot of trouble but if she gets help, she can still turn her life around.
I know you want to help your sister, but she will get into a lot of trouble if she's arrested. Talk with your family and see what they think is the best way to help her. You and your family should stand by her and help her if she's in trouble.
I don't think this is such a big deal. She's not an honest person and she lied to me about everything.
While you want to take care of your sister, maybe just the threat of turning her in would get her to listen to her? Then you could refer her to people that can help her. Putting her into prison would just hurt her life more.