Yes, focus on her weaknesses. Everyone has them. Even sociopaths.
You're a sociopath and from your two short posts I can already say your weaknesses are ego and temper. You want revenge on a girl for breaking up with you and you snap on someone for not being helpful like they owe you. That's why you have these obsessions that are driving you crazy.
It has nothing to do with this sociopath of yours. That's just what's triggering you at the moment. And for the record I've said before that sociopaths have weaknesses too and this is probably an excellent example of it. Need for control will lead to potentially reckless behavior. Snap out of it.
If you really want to get back at her, start dating someone hotter. Preferably someone she hates. If she's also a sociopath she'll end up feeling the same need for control that you're feeling right now. Then you can try to provoke her into doing something illegal about it and get her arrested.
Or you can just let it go and find a new target/victim/whatever you sociopaths are looking for.