While the finding re: Ms Henley is a little surprising I don't think we can fully appreciate her circumstances since (presumably) nobody here knows the full story or was present at her hearing. Nor can we fully appreciate the disposition of the presiding magistrate and thus fully understand his judgment of the issue. That being said she probably had a hell of an advocate who must of been particularly proficient in the art of persuasion (it is, after all, their job). Ostensibly one of the main arguments Ms Henley sought to advance, amongst others, was that without her license she would have lost her job and that this would have adversely affected her family. Hence a preference for a finding that allowed her to keep driving. Motorists frequently seek to have their licenses restored, having been found driving whilst disqualified, on the grounds that they require their license to remain gainfully employed.
In light of any criminal offence section 10 of the CSP Act applies to everyone (and every charge) equally. A view to the contrary would be repugnant to the fair administration justice. As far as NSW laws are concerned there is nothing that precludes the application of s 10 in matters of drink driving. The anomalous issue is that a driving offence as serious as DUI carries with it no sanction in the form of demerit points, hence why Ms Henley received no demerit points; surely a pragmatic oversight of the law makers who would have assumed that anyone charged with such an offence would have had their license disqualified. An order under s 10 acknowledges guilt without, however, proceeding to conviction. This is why Ms Henley's license was not revoked. This is where I have a particular problem with the decision. Effectively the court, in making an order under s 10, extra-juridically qualifies the rules of the RTA. Recall that a magistrate may dispense with traffic offences under s 10 and waive fines etc. but they CAN NOT stop an offender accruing demerit points. If Ms Henley had of disputed her guilt in the matter (i.e. pleaded not guilty) and subsequently "beat the charge" then, at least on legal grounds, I'd be comfortable with the decision.
None of this is meant to be taken as legal advice. At any rate, siddr20, you should consult a lawyer if you want to dispute the penalty.