After graduation, she worked in an accountancy firm specializing in financial records.

accountancy 是由名词 account（账户、账目）加上后缀 -ancy 构成的名词。account 指"账目、账户"，-ancy 是表示"状态、性质"的名词后缀。accountancy 指"会计工作、会计行业"，即处理财务记录和账目的专业领域。