。
She looked up at the sky.
Literal
She [topic-は] sky [object-を] looked-up-at.
見上げる is a compound verb built from 見る ('look') + 上げる ('raise') — 'to lift one's gaze and look upward.' Its opposite is 見下ろす ('look down at, gaze down upon'). Beyond the literal physical meaning, 見上げる is also figuratively used for 'to look up to (admire),' parallel to the English idiom — 見上げた人物 ('an admirable person'). The 空 paired with this verb is a quietly evocative image, frequently appearing in pop song lyrics and lyrical prose.