Yep, it's reinforcement all over. Everything she does that does not shut him off completely, without notice, without any reaction, that is rewarding to him. I don't blame this girl for this, because she did the best she could, but from the outside it is rather clear how this works. The problem is probably mostly emotionally, on her side. For some reason she could not end it completely and hand it over to the police.
Sorry, but it does sounds to me like you are blaming the victim when you write "The problem is probably mostly emotionally, on her side." It's her stalker who has the emotional problem. Calling her emotions the problem appears to me rather sexist, given that women are stereotyped as overly emotional. Furthermore, she DID stop responding, and she DID go to the police, but they didn't do shit. Please read the article more carefully, and please don't place the burden of justice on the victim.
