Psychopaths? Personality disorder?

So I'm wondering if borderline personality disorder is a key reference like antisocial is to sociopaths. And please explain what it is. And psychopathic traits. You see i know this one girl. And when she was younger... She'd abuse her animals by suffocation and stranglation she even killed her bird. And you see. Do some innoproprete things to them and like the feeling is there a name for this? Also could she be a psychopath o.o