Maybe she had the correct visa, and so they didn't look closely at the exemption. It really may be as simple as the visa error that got Djokovic in trouble. Who knows. But I think a "set-up" (as britbox and tennisville both suggested) seems too elaborate to me. A series of cock-ups seems more likely, to me.
Here is the interview by the Karen Andrews, regarding Djokovic. She clearly mentions that the visa was not the issue (at the 2:05 mark) but the part regarding the exemption.
I think it's strange that with the same visa and document for exemption, 2 other people were able to cross the border and be in Australia.
I think its a political setup mainly because there are just way too many mistakes that are happening.
1. Djokovic and as of right now 2 other people were mistakenly granted a visa by the federal government without meeting the requirements
2. The 2 other people were mistakenly cleared by the border force coming under the federal government
3. The federal government approval rating is really poor before this incident
Due to these 5 mistakes, the political standing of the government has improved as a lot of Australians support his decision.
Either you can believe the mistakes were made and it was just a coincidence that fixing them improved his rating or you canbelieve it was a set up to boost his party before the elections in May 2022
I just have seen way too many political parties pull stunts like this close to the election to believe its a coincidence
But he's already getting special treatment, in that his case will be heard in 4 days, not 8 years, like some poor sod in that hotel.
