。
She's a nurse.
Literal
She [topic-は] nurse is.
The simplest possible sentence shape in Japanese: topic-は + noun + です. No verb, no adjective — the copula です does all the predicate work. This is the workhorse pattern for stating someone's identity, occupation, or affiliation. The polite です (rather than plain だ) makes this the kind of sentence used in self-introductions, casual descriptions, or talking about acquaintances to strangers — the default register of polite small talk.