It seems that McCarthy was "severely addicted" to cocaine, and therefore was hangin with a bad crowd that provided a "bad influence". She asked to borrow a cup of sugar to get into Booths house, and the rest is history. The judge thinks she might have been discriminated against by a 11 white & 1 black jury.
Maybe she was discriminated against by being forced to murder an all white woman, because a black one with money wasn't available.