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There's also a film about a similar scenario: https://en.wikipedia.org/wiki/Jerry_%26_Marge_Go_Large (based on https://highline.huffingtonpost.com/articles/en/lotto-winner...)

Google turned up this Harper’s feature which is pretty good: https://courses.washington.edu/psy315/pdf/HarpersMagazine_Lu...

Long article but the likeliest scenario in the article is that the has studied the printing sheet location and sales time distribution of winning tickets to work out when they will appear on the market, then buys up all the newly issued scratchies from compliant shop owners.

This doesn't say anything about how she did it, was it just luck or was there some method?