Why was the past perfect tense used in the following sentenc...

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Q3707605 Inglês
96-year-old secretary secretly grew a $9M fortune


By Sarah Jackson


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(Available at: https://www.cbc.ca/radio/asithappens/as-it-happens-monday-full-episode-1.4651457/96-yearold-secretary-secretly-grew-9m-fortune-then-donates-to-students-1.4651864 - text specially adapted for this test).
Why was the past perfect tense used in the following sentence "Jane Lockshin says when she found out her 96-year-old aunt, Sylvia Bloom, had amassed a fortune of more than $9 million, she had an 'oh my God' moment." (I. 01-02)?
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