Listen, if there is one thing I know it's that your friends want your attention. She wants t know that you care for her by telling her she is doing things you do not agree with. She may not take that advise, but knowing you care enough to make the observation and talk to her about it means a lot. Your friend is who she is and will not change because of your talk, but she'll know undoubtly that you love her and that's really all you can do for her. She (as we all do ) has her own problems and personal demons. That is her problem, not yours. Just love her for who she is, or move on.