Driving offences are treated way too lightly by the public, in general, so I reckon it's good she's getting a custodial sentence for this - especially given her history of ignoring or disregarding judicial decisions affecting her. Maybe it's true that the average sentence for this crime is less than what she's getting. But I daresay that most other defendants don't show up at court claiming the law doesn't apply to them because their servants didn't read all their mail to them.

While all people should be treated as equal before the law, that doesn't necessarily mean that everyone'll get the same sentence for the same crime. Individual circumstances are important, like previous offending and whether they accept the seriousness of what they've done.