。
She is well suited for the job.
Literal
She [topic-は] that work [target-に] is-suited.
適している is the progressive/stative form of 適する ('be suited, be appropriate') — describing the ongoing state of fittedness. The に marks the target of the suitedness. 適する is the slightly more formal counterpart of 向く / 向いている ('face toward, be suited'); both fit this frame, with 適している sounding marginally more deliberate or evaluative — a judgment one might find in a recommendation letter or career assessment.