girl talk

Alright, ladies. Now I know this has absolutely nothing to do with our bodies, really, but I need some advice. My best friend since middle school is making some really bad choices right now and I'm super worried about her but every time I try to tell her that I end up yelling and crying and she just laughs nervously and walks off. I have helped her through thick and thin as long as I've known her, but now I just don't know what to do. I wish I knew what was going through her head. She's such an amazing person and she deserves a guy who will treat her like the goddess I know she is. But she's partying and grinding on random creeps and fuckboys and ignoring me. What do I do?