。
She devoted her life to scientific research.
Literal
She [topic-は] science [of-の] research [to-に] one-life [object-を] devoted.
ささげる ('offer up, dedicate, devote') is a slightly elevated verb often used in serious or ceremonial contexts — dedicating one's life, offering something to a temple or shrine, devoting effort to a cause. The set construction X に一生をささげる = 'devote one's whole life to X' belongs squarely to biographical writing: this is the kind of phrase you'd find in a profile of a Nobel laureate or a memorial to a longtime activist. The sentence reads as a polished tribute.