。
She pointed out the mistake I had made.
Literal
She [topic-は] I [subject-が] committed mistake [object-を] pointed-out.
指摘する ('to point out, to identify') is a slightly formal Sino-Japanese verb often used in academic, business, or analytical contexts — pointing out errors, problems, features. 犯す ('to commit [a crime, error, sin]') is the verb of culpability — 犯罪を犯す, 罪を犯す, 誤りを犯す. The relative clause 私が犯した誤り ('the mistake I made') sits before 誤り as a modifier — Japanese readily compresses what English would split into a main clause and a relative clause.