I need Wisdom

Wow it's been a week. I have been busy busy and I really can't wait for things to level out. I'm in a transitional phase it feels like. I hate not having a routine. Ok so if you read this and you have some advice for me please leave it, I'm really struggling here. My little sister (well ok she's my God sister, but she's also my dance assistant and one of my best friends) is really just making stupid desicions. I know that everything happens for a reason, and that God has this under control, I just don't know how to handle it. She had been dating this guy and I really, really (REALLY) don't like him. It's not just a personality conflict or something like that. I really did try to like him, and had decided to just let it go and be nice to him. But then I found out some actions that he had taken against my baby girl and now I want to kick him in is throat. I REALLY don't like him. Anyways they had broken up and she was dating other guys and doing so well, and accomplishing so much for her self, gaining so much self esteem, and finding out who she is, and he just came back in and is sweeping it all out from under her. My whole dance studio is centered around helping young girls know their own self worth and not finding it in a guy. And I can't even help my little sister. She is so awsome, and he is so not worth her. The emotional abuse that goes on in that relationship breaks my heart. He tells her that she's not good enough to date him, and that he could find someone better. She is so living my life. It's so weird. The exact things I delt with with Matthew are happening in her life. And she saw it happen in my life, but can't see it in her own. She really thinks that he will change. I just want her to know that she's worth so much more and God has so much for her. They aren't back together, and she knows that we hate him. Well ok not hate, but I REALLY don't like him (have I said that already?). There is so much more that goes on than what I've said here, it's just not my place to tell. I really don't know what to do. I want to just back out and let go and Let God. But I know that's not really the situation in this case. I just feel like she's going to have to crash and burn before she's going to decide that it's not worth it. I don't know how people delt with me while I was with Matt. I have no clue. I know that people saw the same thing in me and that I came around because I was running from God. I later delt with my self esteem issues. I don't know that there's anyone speaking God into her life. I guess that's why I feel like I have to stay in here, whole heartedly. It would be so much easier to just scream at her. If you knew her you would understand. She's beautiful, perfect body, cheerleader, she can dance too. She dresses cute and drives a cute car, she was popular in highschool. When she walks in a room everyone knows it. She's smart and going into pre-med. I mean it doesn't get much better being a girl. And this guy is such scum. Short of God he'll never change. And I don't want bad things for him, don't take it like that. I just don't want him around her. I wish I could make her see what she's worth. I wish that she saw what I saw. I'm hoping she'll go to church with me tomorrow. But I don't know. I'm scared to push too hard. I'm scared she'll shut me out too. Anyways if you have any advice please drop me a line. I love you guys.

Amber G