、。
She suddenly stopped and looked around.
Literal
She [topic-は] suddenly stopped-walking-and, surroundings [object-を] looked-around.
Two compound verbs in one short sentence. 立ち止まる combines 立つ ('stand') + 止まる ('stop') — 'come to a halt while walking.' 見回す combines 見る ('see') + 回す ('go around') — 'look all around.' 突然 ('suddenly') is a productive adverb for abrupt action.