Was the moment when her mother asked her to buy a lottery ticket.
Reasoning why is because Haidri wrote an essay explaining how the poem "Lottery" was written. She claims this poem was written after her mother asked her to buy a lottery ticket. This request provoked a range of feelings, as Haidri felt surprised by the request. Furthermore, she found the sudden request funny and was even curious about the outcome of these moments. These emotions were very impactful for Haidri and she felt that she could only express them through a poem, which then lead to “Lottery”.