。
She has a talent for acting.
Literal
She [topic-は] acting [genitive-の] talent [subject-が] exists.
才能がある ('have talent') is set vocabulary — note that the talent is grammatically the subject (が-marked), and the person is the topic. This same XはYがある frame describes possession of qualities, abilities, and parts: お金がある ('has money'), 自信がある ('has confidence'), 経験がある ('has experience'). 演技 specifically refers to acting in the dramatic sense (theater, film, role-playing); a related word 演奏 covers musical performance. The の binds 演技 to 才能 as 'talent for acting,' a pattern productive across domains: 数学の才能, 絵の才能.