。
She raised her hand.
Literal
She [topic-は] hand [object-を] raised.
手を上げる (to raise one's hand) is the standard expression — used in classrooms, meetings, or any context where raising a hand signals attention or participation. 上げる (to raise) is the transitive counterpart of 上がる (to rise). A minimal sentence that could fit many contexts: volunteering, hailing a taxi, or signaling agreement.