There is more to consider than merely justice. We also have to protect society from her. How could she ever possibly be trusted again to anything? Hell, I wouldn't even trust her to bag my groceries. She lied about her background once, and harmed thousands of people. Who is to say that in 20 years she won't be found under another name, in another state, running this or another scam again?

If our system was set up to rehabilitate, that would be great, but it isn't. As long as she remains un-rehabilitated, she should be kept locked up. Not out of some sense of justice or for retribution, but simply to keep her from harming others again.

You're right, it's also about deterrence, incapacitation, and reparation to the victim, in addition to punishment.