Just a note besides the question weather Erika is a “Psychopath“ or not:
I’m pretty sure Psychopathy as well as pretty much anything else exists on a distribution curve, meaning, for example, that in terms of smartness or IQ many Psychopaths probably exists that are well below average levels in that regard, many that are on an average level and many that are above average. So, I don’t think anyone can easily say that just because a person is (or appears to be) stupid or smart has to necessarily mean that he is a Psychopath or not. Good example in terms of Psychopathy in that regard is that in prisons the not so smart ones tend to be concentrated.
It is also important to understand in such distribution curves that “a Psychopath“ can come in many colors, proclivities and temperaments as is the case with ordinary people as well, such as: some tend to be lazy, some tend to be the opposite, some tend to be violent, some don’t and so on (endless differences).