。
She made us a delicious dinner.
Literal
She [topic-は] us [to-に] delicious dinner [object-を] made for-us.
おいしい ('delicious') is the everyday word for tasty food — slightly more casual than うまい (which can also mean 'skillful' and is more masculine in flavor). The benefactive ~てくれる layers the kind-act framing onto her cooking — without it, the sentence would be a flat report. 夕食 ('dinner, evening meal') is one of three meal nouns: 朝食 (breakfast), 昼食 (lunch), 夕食 — Sino-Japanese readings for slightly more formal usage; 朝ご飯 / 昼ご飯 / 晩ご飯 are the casual everyday alternatives.