Who caused the disruption though? The woman, or the state governments?
There are two types of disruption... one to the community and the others to individuals.
The community wide lockdown/lockouts occurred because of the state gov. I'm sure it'll be the subject of much debate in years to come if it was necessary but after what has occurred in NSW/VIC, I can understand why they're taking a better safe then sorry approach.
The other aspect of this is the impact to individuals. For those who've travelled on the same flights as her ADL-CNS and CNS-DRW who now have to spend time either getting tested or for those unlucky to be sitting around her now spending 14 days in quarantine.
I don't know about you, but if I flew from CNS-DRW (on a route that should be presumed safe) and then was told a few days later I'd have to spend 14 days in Howard Springs because I sat next to some one who's lied across borders I'd be rather annoyed. Now I appreciate there is a risk this could happen anytime/anywhere these days but these two routes shouldn't have been a problem.
Right now international flights to/from Australia are arguably safer given everyone has been vaccinated and for inbound travel (and about half of outbound travel) all on-board have been tested.
Domestic flights are crazy right now (not that they hadn't been earlier in the pandemic) and things are just going to get worse, here are some crazy example of things that are allowed but shouldn't be.
1. Someone from NSW/VIC (without a test or vaccine) can fly up to QLD and transit through Brisbane airport (no restrictions on transiting), they can then board a plane to SA/NT/WA and potentially sit next to people who are allowed to enter SA/NT/WA with no restrictions as QLD is very low risk. Obviously if that person is honest they'd enter quarantine but others around them wouldn't have to.
2. I can fly from BNE to SYD to MEL to HBA and then back to BNE. Provided I don't leave the airport in SYD or MEL I wouldn't be subject to any restrictions when entering TAS or QLD even though I could have sat and mingled in an airport lounge with others from SYD/MEL for hours during my layover.
3. When QLD starts it's home quarantine in 10 days time, the health minister stated that those coming from NSW/VIC would be allowed to fly into Brisbane airport and then connect to an intra-state flight eg SYD-BNE-CNS to reach the location they'll complete the 14 days home quaratine. Meanwhile they've just flown a BNE-CNS flight with people not subject to any restrictions at all. (This may change but this is what she said at a press conference the other day - offical guidelines are yet to be published).
These are just three example which come to mind, and I find it crazy how many loopholes exist for domestic travel. It's crazy that I can fly from Brisbane to Sydney airport have a beer in the terminal with someone from Sydney and then fly back validly claiming that I was just transiting.