Crandell said that she was using this incident as a lesson to her daughters about the importance of doing the right thing.
It's good that Crandell has no regrets about allowing Mackenzie in front of her, since there's no reason for regrets: the winning Powerball lotto probably would not have gone to her anyway.
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Destiny or Random Chance?
The reason is that each Quick Pick number drawing is random and independent. That is, the numbers that are generated on a particular draw have nothing to do with the numbers that are generated before or after it.
Mackenzie could not have purchased the lotto numbers destined for Crandell; it's not like the 540,003rd person who buys a lottery ticket would necessarily get those winning numbers; it could just as easily have been the 540,004th person.
Statistically, Crandell - as the person behind Mackenzie in line - had just as much chance of getting the winning numbers as the person ahead of Mackenzie, and the two-thousandth person after Mackenzie. Thus Mackenzie did not end up with the ticket destined for Crandell.