The fuck and dump strategy is amazing to get back at some head games playing moron.
1) When she finally goes out with him, your friend bangs the hell out of her the first or second date
2) He leaves her behind, never to speak to her again
3) Girl seems bewildered that someone could play games with her and will do either one of two things:
3a) Realize that she got what she deserved by being an idiot and rectifies her mistake
3b) Too much of a flake to realize what went on and will go on her business.
Either way, its win-win and she has the chance of improving herself.