。
She's a teacher.
Literal
She [topic-は] teacher is.
A minimal copula sentence with the polite form です. 先生 (せんせい) literally means 'one born before' (先 'before' + 生 'born/life') and is used far more broadly than 'teacher' — it covers doctors, lawyers, politicians, artists, and anyone in a mentoring or authority role. Context determines which sense applies.