。
She gradually cut down her expenses.
Literal
She [topic-は] expenditures [object-を] gradually reduced.
Three pieces of vocabulary lift this sentence into formal/written register. (1) 支出 ('expenditure, spending') vs the everyday 出費 — both name spending, with 支出 leaning toward accounting and budgets. (2) 徐々に ('gradually, little by little') is a common formal adverb. (3) 削減する ('to reduce, to cut down') is a heavy Sino-Japanese verb — 削 ('shave, scrape away') + 減 ('reduce'). Common in news, business, and policy writing about budget cuts, layoffs, or quotas.