This is the 6320th most frequent Russian word.
участвовала
"Participated."
The word "участвовала" is used to indicate her engagement or participation in a specific event, which is competitions in this case.
Она участвовала в соревнованиях по бегу.
She participated in the running competitions.
Here, "участвовала" conveys the involvement of the subject in a preparation activity for an event.
Моя сестра участвовала в подготовке к школьному концерту.
My sister took part in preparing for the school concert.
In this sentence, "участвовала" describes the teacher's active role in an organized gathering or event.