Playing devil's advocate (literally... lol)
What is she confessing to?
An accident and a panicked response to the death?
What kind of accident?
Is it one you can even attach negligence to?
and if you can't you charge her with what?
obstruction, already done.
abuse of a corpse?
she says he did it?
if the accident was negligent how do you prove it?
and who was responsible for her?
And if it was a negligent or abusive act, who delivered the blow?
You have his word against hers as the only eye witnesses and they both have major credibility issues. She admits she wrote the cover up note. He is on tape selling some BS story to a 911 operator in the same cover up.
This why I think he disposed of the body.
And she thinks he used the woodchipper because it would destroy any chance at showing cause of death. And he told her used it. That is why LE ripped that thing apart. But maybe he didn't use it, maybe he couldn't stomach it, so maybe there is a skull fracture out there to be found. Maybe.