。
She had what it took for the job.
Literal
She [topic-は] that work [genitive-の] capability [subject-が] existed.
力量 (りきりょう, 'capability, capacity, prowess') is a Sino-Japanese compound — 力 ('power') + 量 ('quantity') — used for someone's ability or competence to handle a particular task. ~の力量がある ('has the capability for [X]') is the canonical frame for asserting fitness for a job. Slightly heavier than 能力 ('ability'), 力量 emphasizes proven, demonstrated capacity rather than potential. Common in evaluations of leaders, athletes, or anyone judged on track-record performance.