finding that severance was not required because, "[a]lthough only a small percentage of the proffered evidence directly implicated [the defendant], a much greater percentage of evidence was relevant to the charges against her because it showed the nature of the scheme in which she was allegedly involved and how the scheme was executed"

upholding $20,000 fine for tax fraud

striking the head with a hammer, stabbing the chest with a chisel, and strangling the neck with an electric cord showed specific intent to kill