This is the 17712th most frequent Russian word.
удивлена
"Удивлена" means "surprised" (feminine form).
In this sentence, 'удивлена' is used to express the speaker's state of being surprised or amazed by the unexpected presence of the listener.
Я удивлена, что ты здесь.
I am surprised that you are here.
Here, 'удивлена' describes the past emotional reaction of the subject (she) to the outcomes of the exam.
Она была удивлена результатами экзамена.
She was surprised by the exam results.
The word 'удивлены' here is used in its plural form to indicate the shared emotion of surprise among a group of people due to someone's decision.