As I've written in other posts,it was clearly premeditated murder. She KNEW he would eventually die if left alone without help,and didn't even offer him a glass of water to help with the shock,or a aspirin for pain. It would have been a more humane death if she had cut his throat,rather than let him suffer for 3 days. In fact,this amounts to a torture murder.
Your argument is quite convincing. I appreciate your commentary - thanks.