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è stata lei a

it was her who

→ essere
phrase Rare #23,792
it was her who Used to emphasize that she, and not someone else, did the action. The following verb is usually in the infinitive.
IT: È stata lei a chiamarmi ieri sera.
EN: It was her who called me last night.

Non è stata lei a portarlo in terapia?

Wasn't she the one who took him to therapy?

È stata lei a farlo fuori!

She was the one who took him out!

— Carandiru (2003)

È stata lei a provarci.

She was the one who tried.

— Rental Family - Nelle vite degli altri (2025)

È stata lei a fare l'errore!

She was the one who made the mistake!

È stata lei a raccontarmi la verità.

She was the one who told me the truth.

— RRR (2022)

È stata lei a farvi questo!

She did this to you!

— Wicked (2024)

È stata lei a convincermi.

She was the one who convinced me.

— La grazia (2025)

È stata lei a raccontare questa storia a un agente quindici anni fa.

She was the one who told this story to an agent fifteen years ago.

— Una battaglia dopo l’altra (2025)