There's a lot more on YouTube about this, including her full interviews, the trial, and her sentencing.
A few points stood out to me.
No one heard Ajika threaten to kill Susan. In his summing up, the judge pointed out that AJ was asking for Susan to come outside, indicating she had no intention of entering Susan's home. This was verified not just by immediate neighbours but the houses behind. They all agreed AJ was loud and angry, but not one of them reported hearing AJ make any threats.
The door had been reinforced by the LL a few months earlier. The police tried to recreate "the whole house shaking" and the door looking like it was about to give way. Even with a 6-foot male detective throwing himself full force at the door and kicking it with all his might, the door did not budge, nor did the whole house shake. The forensic techs inside the house, while the detective was kicking the door, stated that the walls vibrated, but at no point did it seem like the detective was about to be able to make entry. When examining the door after the shooting, the hinges and the deadbolts were still firmly in place, evidencing that the door had not shaken excessively hard when AJ was knocking.
The room Susan got the gun from also had a lock. Susan could put a second locked door between herself and AJ; instead, she chose to move closer to the first door and shoot.
There was a couple of seconds of silence between AJ shouting and the shooting, as the judge pointed out in those seconds, anyone could have put themselves between AJ and the door, including the child or the police Susan had called.
She researched stand your ground laws in the months leading up to the shooting.
I don't believe her reaction to hearing AJ had died was genuine. Immediately afterwards, she is 100% calm and composed. There is not a single tear on her face.
Ditto during sentencing when AJ's mum made her victim statement, Susan showed no emotion. She appeared bored, if anything.
No one with an ounce of common sense could have had reasonable doubt.
She is guilty and deserves every second of her sentence.