How can I help my best friend to improve her self esteem?

We've been friends for 15+ years and we've been through all sorts of things together. I used to have low self esteem, and for years I felt fat and ugly when I was not. Fortunately I overcame that, now truly I am happy with myself and I feel good about myself. My friend still is stuck in the rut.. she has lost a lot of weight lately and she looks great, she is a beautiful girl inside and out. But she doesn't feel it.. she wants to get breast implants when she has a nice set already, she always feels she is fat when she is not.. it's just terrible to see her feeling that way about herself. I have told her the truth, that she is beautiful and sexy and a great person, our other friend and I were both telling her that last night.. and she just can't see it herself. How can I show her? how can I help her believe in herself?