I believe even though the girls befriended her and cared about her she never believed it. She always felt inferior. After all, she was damaged so much as a child.

Those girls were playing with fire as well, dating drug dealers.

How sad for her friend to ask her, "why?", and she still bludgeoned her to death? Pulling a trigger is one thing. Beating someone with an object is quite another.

I give the husband credit. He must have been so shocked and also feared for his own life in case his wife snapped again. This is just one, huge, sad story.