This commenter dug up even more baffling details: https://aussie.zone/post/15912083/13633454

The Guardian’s headline is.pretty tame all things considered. You could have had:

• US woman backflips in court, pleads guilty to smuggling 24-carat gold gun into Sydney
• Clown school student who tried to smuggle gold-plated pistol into Australia claims Google said it was ‘OK’

From the first one:

Goodson had declared that she was carrying cat, squirrel and rabbit parts on her incoming passenger card, but failed to mention the gun.

…

The court also heard that she previously owned two other guns while living in the States, but she had accidentally given them away.

“Those guns I ended up giving away, because I accidentally left them in a donation box.”

From the last one:

Her lawyer said she packed the pistol because she was high and paranoid from synthetic marijuana

She also has a horn and a bone through her nose.