What I'd like to know is if the girl is genuinely sorry for what she did or not... If not, she is and will be a danger to society and the key to her cell should be thrown away IMHO.
Still, prison will not be her only punishment. I hope she has finally seen the light and has figuerd out the guy she wanted is a scumbag and doesn't want him anymore. Besides that guy, I doubt there are many men who'd risk dating her, so I assume she's going to lead a very lonely life as soon as she gets out of prison. (of course this assumption is based on my hope & common sense of other guys)