For anyone that I have heard say she has no pattern of this kind of chaos in prior relationships, to that I say, it drives the point home even more that this is a classic Stalker situation. If they don't have this weird almost chemical attraction for a man, they can and do walk away, they actually get bored and move on. Once they lock eyes on someone and there is this "thing", um, he'll be lucky to get out alive. Same if a man is the stalker and goes along fine until he sets eyes on "the one". Once you live through it, you know how possible it is that someone has no criminal record, no real reputation for being bat shi* crazy...until that moment.
They can go along very normal, in and out of relationships and to some, not show an ounce of weird behavior, nothing that sets off alarm bells (I must admit my bias in that I do feel men fail to recognize "trouble" sleeping next to them in bed, as fast as a woman realizes it)
I am sorry, and hope I don't offend any men, I believe this stems from social cultural ways we are different. Men tend not to be afraid of women until they wake up and go to the kitchen in their boxers and find her standing there holding their cats body in one hand and the cats head in the other and her nightie is covered in blood and there is a knife on the cutting board.