help

I don't know what to do. I have a few friends that.. abuse their body in ways that are not good. And I have other that I suspect that she's doing bad stuff to her body. I don't know what to do. I don't see her often at all.. if anything, it's once in a blue moon.. but I wish I could help her. Thing is, all I can do from where I am now, is probably just send her encouragements and just pray for her. Sometimes, we forget how powerful and amazing prayer really is. But yea, I'm not all too sure what to do.. but I really pray that God's name will be glorified ultimately in everything that I'm here for.