"Bloody hell! Is this my cousin pranking me?" the incredulous winner reportedly said after picking up a call from Powerball operator The Lott.
"My cousin is pranking me!"
The woman from the NSW Northern Rivers town of Ballina, who had bought her lottery entry online, was the only person in Australia to get a division one win - getting all seven numbers, plus the Powerball number correct - on Thursday night.
"We recently had a death in the family, and I think it's a sign from them; they're so looking after me!" she said.
"We've had signs all day from them; things moving, cans moving, bags waving in the wind."
The winner said she would pay off her mortgage and help others out.Â
"This will help a lot of people. Not just me but lots of family members," she said.
She added that she would be "celebrating with breakfast in bed tomorrow - scrambled eggs and bacon for me!".
Her $100 million jackpot makes the woman Australia's third-biggest lottery winner.
She paid $18.90 for the 12-game QuickPick entry.
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