This is the 2505th most frequent Russian word.
проиграла
"Проиграла" means "lost" (referring to a female subject).
In this sentence, 'проиграла' means 'lost', implying the outcome where the subject did not win the game.
Она проиграла в шахматах.
She lost in chess.
Here, 'проиграла' again means 'lost', used in the context of a sports competition to indicate defeat.
Её команда проиграла матч.
Her team lost the match.
In this hypothetical sentence, 'проиграла' is used in the subjunctive mood to describe a situation that did not happen but is speculated.