The woman, who has not been identified, did not realise her newfound riches until Tuesday morning when she turned her mobile data on.

"I checked my emails on Sunday and hadn't received anything to let me know I had won so I thought 'oh well, I haven't won anything'," she said.

"I then turned off my mobile data and my phone was on silent while I was at work yesterday, so I completely missed Tattslotto's emails and calls.

"When I got home, I thought I'd check my emails and saw one prompting me to check my tickets. I logged onto the app and clicked on my ticket and saw how much I had won! I couldn't believe it!"

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The winner revealed that she changed her usual numbers shortly before submitting the ticket.

"As I was about to put it on, I thought 'I haven't had much luck with those lately' so I decided to go for a QuickPick at the last minute instead ... I'm glad I did!" she said.

The St Helens resident said she planned to celebrate with wine and may use the money on purchasing property.

"It's come at a great time of life for me. It will really help set me up for the future," she said.