My neighbor says she is anorexic?

If she was actually anorexic she wouldn't be average weight. She'd be way under and would be completely manic about food and exercise. If she does have an eating disorder it might be bulemia. If I were to say anything it would be that she should stop talking about anorexia as if it's a joke. So many girls actually have it and die from it. Tell her to grow up. If she is standing by the fact that she has an eating disorder then I would talk to your mom about it. She can then talk to your friends mom.