She was astonished when she saw what was in front of her.

astonished 是动词 astonish 的过去分词形式，表示"使惊讶、使震惊"。astonish 由前缀 a-（加强语气）和古法语词根 tonir（雷声）组成，字面意思是"像被雷击中一样震惊"，形容极度惊讶的状态。