How do you stop a girl thinking shes ugly?

Is it a family member? If it is... start every day by saying, You are so beautiful! Is there any one telling her she's ugly? Try to stop it, If she's still in school... and there's a person there telling her she's ugly, bring it up with a prince able, a teacher, I'm just fifteen so do whatever is necessary! But if this is a friend tell her how pretty she is, and if she still doesn't think so, Pay some one she does not know to tell her how pretty she is! Good luck! ;)