this is what you do take pictures of her stalking you and try to get a video also than go to court and get a restraining order and also make her go to a mental institution after that she will finally realize that shes a moron and she will leave you alone ^_^
Only problem with that is that if she catches him taking pictures and videos of her she may get suspicious or get the wrong idea. However, it just might work, however it's risky.