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彼女はその仕事に

she ... that job

→ 彼女
phrase Rare #29,041
she ... that job This is an incomplete phrase rather than a fixed expression. 彼女は means “she,” その仕事 means “that job,” and に marks the relationship between the job and the following adjective or verb, such as being suited to it, devoting oneself to it, or succeeding at it.
JA: 彼女はその仕事に興味を持っている。
EN: She is interested in that job.

彼女はその仕事にうんざりしている。

She’s fed up with that job.

彼女はその仕事に適していないと思う。

I don't think she's suited for the job.

彼女はその仕事に不向きだ。

She is not suited for that job.

彼女はその仕事に成功した。

She succeeded in the job.