Well, I think that might be reasonable. A Psychopath is an established diagnosable disorder, with accompanying disabilities that cause the behaviors. Children around the age of 4, who are normal, begin to realize that other people have other perspectives than their own. You may be hungry, while I am not. You may feel cold in the same room where I am warm, etc. There are kids who don't develop this- they literally lack the ability to understand that others have a different perspective. There are a lot of fascinating tests that show this - the "doll house" test, where the child is able to see what all is going on in all the rooms and is asked questions about things going on in the house from the perspective of the various dolls in various rooms. Kids who have this lack of perspective believe all the "dolls" should know what they the child knows - what the dolls who are in different rooms are doing, just because the kid knows. Kids who aren't psychopathic recognize that from each dolls perspective, they may or may not know what's going on in the rooms, depending on what they can see or hear. The psychopathic child can't grasp that everyone doesn't know and experience what they know and are experiencing. "If I eat all the donuts and you have none, that will leave you hungry" is something a child at risk for being a psychopath doesn't understand, literally.
So yes, maybe she might be diagnosed as a psychopath, I don't know. But "selfish greedy enabler" seems to indicate it's a choice, rather than a brain disability.
And the more we know, the more we know. People rarely choose to fail if they have the ability to succeed.