。
She was kind enough to make us some tea.
Literal
She [topic-は] kindly [emphasis-も] us [to-に] tea [object-を] brewed-for-us.
お茶を入れる (おちゃをいれる, 'to make/brew tea') is the standard phrase for preparing tea — the verb 入れる literally means 'to put in,' referring to putting tea leaves into hot water. The に marks 私達 as the beneficiary of the action. Making tea for guests is a fundamental act of Japanese hospitality, and the お- prefix on 茶 reflects its place as a respectful everyday offering.