。
She dedicated her life to education.
Literal
She [topic-は] whole-life [object-を] education [to-に] dedicated.
捧げる carries quasi-religious weight — its core sense is offering something up to a deity, ancestors, or a higher cause; the etymology routes through 'lifting both hands.' Using 一生を捧げる ('dedicate one's life') treats the life itself as the offering, with the recipient/cause marked by に. Common in obituaries of teachers, missionaries, doctors, and other figures whose biographies are framed around a single calling.