I think she definitely had some problems. But from what I heard of her MMPI results, it was not narcissism or psychopathy, like Nancy Grace & Co like to preach. That's the main reason I felt like she may have "snapped" and went into a dissociative state (where all the overkill happens) rather than premeditate murder.
But, on the other hand, since the trial (that i didn't pay attention to til the end), I heard that her grandparents gun was stolen and happened to the same caliber as the bullet she shot at him. THAT would point to premeditation, NOT the overkill. Killing in self-defense isn't necessarily less bloody or violent.
So, luckily I am not on the jury. I'm starting to feel like maybe she fooled me?.....but how would her MMPI scores be the same as mine? (generally all in the same directions) You can't fake those!