One of my best friends has really changed lately. All she does is complain about everything - the school stinks, the teachers are horrible, the coach is unfair. And she's become a terrible gossip, spreading rumors, stirring up trouble and talking bad about everyone. I don't even like talking to her anymore... But our daughters are best friends and do everything together, so I can't really avoid her. Is there any way to help her change her attitude, without being rude?