I agree, I don't think executions are a morally valid activity for a society to engage in. And in a practical sense, it's much more important that criminals be caught and convicted consistently, and prevented from continuing to hurt others. She should be stripped of her wealth, and under permanent house arrest, and be allowed to continue working and contributing to society... but under the close scrutiny as some who is known to have hurt a lot of people, and would probably do it again if given a chance.