This is the 2480th most frequent Russian word.
предупредила
"Warned" or "alerted" (feminine, past tense).
In this sentence, "предупредила" is used to express a warning or notifying someone about a potential issue.
Она предупредила нас о возможной опасности.
She warned us about potential danger.
In this context, "предупредила" means to inform or notify someone about an event or information in advance.
Учительница предупредила учеников, что контрольная работа будет в пятницу.
The teacher informed the students that the test would be on Friday.
Here, "предупредила" stands for advising or giving caution about a behavior or action to take.