。
She raised nine children in her lifetime.
Literal
She [topic-は] whole-life [of-の] within [in-に] nine-people [of-の] children [object-を] raised.
~のうちに ('within X') frames the time span — 'over the course of one lifetime.' The counter 人 (read にん from three upward; 一人 ひとり and 二人 ふたり use native readings) counts people; 子供 follows the count via の to form '九人の子供' ('nine children'). The polite ~ました fits biographical or memorial narration to a third-party audience — common in obituaries, tributes, and heritage retellings. Nine children would have been remarkable even in pre-war Japan and is striking to a modern audience, given the country's birth-rate decline.