。
She poured in water.
Literal
She [topic-は] water [object-を] poured-in.
そそぎ入れる (そそぎいれる) is a compound verb: 注ぐ (pour) + 入れる (put in) = 'to pour in.' The double action emphasizes both the pouring motion and the entering of the liquid into a container. A simple, concrete domestic action.