She locked down a city and other areas which caused the mass exodus of people to Sunshine Coast, Gold Coast and Airports. line ups at super markets all over the city to panic by crap wrap because you need 100 rolls for three days she could have created her own super seeding event.
Within 20 minutes of Anna's announcement there was a queue 100m long to get into the local Woolies. Inside the store, people waited in queues winding through the aisles for 45 minutes to check-out, as other shoppers squeezed among them. After an hour the queue outside was 300m long in 2 directions, all standing half a metre apart, with maybe one in twenty people wearing masks. This was repeated at most shopping centres with a Coles/Woolies/Aldi around Brisbane.
It could be argued that the manner of implementation actually dramatically increased the likelihood of the virus spreading; if there was ever a significant danger of it spreading at all.