Frankly, I'm appalled at the implication that, just because this woman was treated poorly in a divorce, and had the poor judgement to get involved with criminal, her involvement in a plot to have her husband killed was a "mistake" that is not her responsibility. There are plenty of people who, even under more extreme duress, know that they do not have the right to take the life of their tormentor. They have the strength of character and moral compass to resist such a suggestion, let alone participate in a plot to kill the father of their child or anyone else.
She was willing to deprive her daughter of her father and her husband's family of their loved one. She was willing for her ex to suffer at the hands of carjackers. In other words, she was putting her comfort and desire for revenge above the life of another person and the happiness of others. That feeling of superiority and entitlement does not suddenly emerge under stress. It may lurk hidden from everyone, but a humble person of strong character could not be manipulated into violating another's right to live under any circumstances. They would rather die than commit murder. And no, she was not "mental." If she was struggling with mental issues, getting help is the appropriate response, not murder followed by suicide to avoid responsibility.*
We need to be very careful about justifying murder (or plots to commit murder) on the basis that the victim was a horrible person. This has nothing to do with "walking a mile in their moccasins." It is fundamental to the law of our society. I argued this point long and hard when WS members were convinced that Gypsy Rose Blanchard(e) had "no choice" but to kill her extremely abusive mother (in her sleep) in order to escape. Our sympathy for the killer's situation (which I felt deeply) should never twist our thinking so that we justify cold-blooded murder. If we go down that path, we are undermining the law and giving ourselves the individual right to pass life or death judgement on anyone who treats us badly. Play that scenario out in your minds. Is that the kind of uncivilized society we want? We are already headed in that direction. Websleuths is full of murder cases that sicken us and this is another one that should sicken us even though it didn't happen. No excuses. Please.
*I've been on enough "suicide threads" here to have an understanding that ongoing long term depression can cause a decent, loving, normally unselfish person to want to end their unremitting suffering and to think that others would be better off without them. I dont agree with the action, but I understand. That kind of suicide is quite different from using it to escape consequences of wrong actions IMO.