Prison isn't just punishment, it's a deterrent to future criminals. If white collar criminals got to chill at home for few years, do you think we would have end up with more victims of fraud, or fewer?
That said, I'm all for jailing her as long as non-white-collar criminals are getting the same treatment.
Edit: This seems to be a controversial opinion as this comment's score is continuously going up and down.
As a simple example, I’ve heard a lot of people of all ages comment that the bankers would repeat the kinds of crimes they committed during the mortgage bubble because they made more profits than they were fined. Jail time is far more plausibly a deterrent in those cases.