Normal
I see you are also trying to determine what diagnosis may fit you step-daughter difficult child - I think the age makes a huge difference - at 19 may not be what they are at 30 - My daughter is 40 so to expect any changes would be foolish on my part. Also because getting difficult child in for a proper diagnosis is so hard, a little research into the various personality and mental health disorders would be necessary before you could start to pieces together of the "what" are you dealing with. My own journey of discovering my daughter is either a sociopath or has sociopath tendencies was when I went to therapy and explained the situation. Once the therapist opened my mind to the fact that my daughter only operates in one of two ways; control/manipulation, was able to start the process of researching what "fit". I don't really focus on her going in for diagnosis, because hey when you are perfect as difficult child thinks she is she doesn't need help.