。
She shows a very positive attitude toward her work.
Literal
She [topic-は] work [toward-に対して] very positive attitude [object-を] is-showing.
に対して ('toward, with respect to, regarding') is the standard compound particle for marking the orientation or target of an attitude, action, or feeling. Slightly more formal than the bare に. 態度を示す ('show an attitude') is a fixed collocation common in psychology, business, and social commentary. 積極的 ('proactive, positive, active') uses the productive ~的 suffix to make the noun 積極 ('positive, willing') into a な-adjective.