This is the 11789th most frequent Russian word.
закончила
"Finished" or "completed" (feminine, past tense).
In this sentence, 'закончила' is used in the sense of 'finished' or 'completed', referring to completing an activity.
Я закончила читать книгу.
I finished reading the book.
Here, 'закончила' implies graduating or completing an educational course.
Она закончила школу в прошлом году.
She graduated school last year.
Here, 'закончила' is used to indicate the completion or conclusion of an event or activity.