。
She cleaned up after the meal.
Literal
She [topic-は] meal [possessive-の] cleanup [object-を] did.
後片付け (あとかたづけ) is a compound noun: 後 ('after') + 片付け ('tidying up') = 'cleanup after an event.' The pattern 食事の後片付けをする is the standard phrase for washing dishes and clearing up after eating.