You're right. If I knew your family would be murdered and I would get money from it, and I went right along with it without attempting to alert the police, I don't deserve any punishment. I didn't kill your family members.
You keep speaking of her "low IQ". Once again, I heard her speak. She was not mentally incompetent. And even if she HAD the 72 IQ the tests claimed she did, she's STILL ABOVE the legal threshold that has been deemed viable by the federal government. Once above a 70, HER IQ IS NO LONGER AN ISSUE. Saying, "Oh, she's too stupid to know what would happen after those two guys killed them", is an Appeal to Emotion.
That's what your entire argument has been.