This is the 6256th most frequent Russian word.
удивилась
"Was surprised" or "was amazed."
The word 'удивилась' here expresses an emotional reaction of surprise upon discovering new information.
Она удивилась, узнав об этом.
She was surprised to learn about this.
In this context, 'удивилась' conveys a personal reaction to an unexpected situation at a specific event.
Я удивилась, когда увидела его на вечеринке.
I was surprised when I saw him at the party.
Here, 'удивились' illustrates a collective sense of astonishment regarding an accomplishment.