How, exactly?
You not contacting her doesn't magically stop her from contacting, stalking, etc. you. If you're dealing with a woman that deranged, then you should have a restraining order because that is pretty much the only legal recourse you have. Threats etc. don't really work because of how the system is set up and its black-and-white view of conflict between men and women. So if you're not avoiding her contact because of something physical she can do, like harassment or vandalism or even assault, the reason must be something along the lines of protecting your feelings. Via avoidance... i.e. exactly what Bible_Belt is saying. Also, by calling them "toxic women" and saying they "can ruin you", you're explicitly giving them power over yourself. This is all in your frame of mind. If you believed, honestly believed, that she was just another woman, you wouldn't be afraid of her. But afraid you are. Presumably because you know that if you talk to her, you'll fall right back under her spell. In other words, you're still AFC at heart.
Sometimes you do need to go NC to break the spell... but don't put the onus on the woman and pretend like you aren't responsible for your own feelings. That's weak as fuck.