。
She looked up at the ceiling.
Literal
She [topic-は] ceiling [object-を] looked-up-at.
天井を見上げた — 見上げる is a compound verb combining 見る ('to look') and 上げる ('to raise'), meaning 'to look up at.' 天井 ('ceiling') uses the kanji 天 (heaven) + 井 (well), an evocative etymological composition. The sentence is simple but visually clear.