。
She kissed me on the cheek and said good night.
Literal
She [topic-は] my cheek [to-に] kiss [object-を] did-and goodnight [quotative-と] said.
ほお (頬) is the standard / neutral form of 'cheek' — Japanese cycles through formal, neutral, and affectionate variants of common body parts (ほお neutral, ほっぺ affectionate / childlike, 頬 with kanji slightly more formal). おやすみ ('good night,' from お休み 'rest') is the universal goodnight greeting, used between family, partners, and close friends. The full polite form is おやすみなさい. The と quotes the spoken phrase, with 言う as the reporting verb. The te-form chains the two actions: kissed and said.