This is the 8372nd most frequent Polish word.
pilna
"Pilna" means "urgent" or "diligent" (feminine form).
Here, 'pilna' means 'urgent' and describes the immediacy of the situation.
Sytuacja jest pilna i wymaga natychmiastowej reakcji.
The situation is urgent and requires immediate response.
In this sentence, 'pilna' is used to mean 'diligent' and refers to someone's conscientiousness.
Ona jest pilną uczennicą, zawsze oddaje pracę na czas.
She is a diligent student; she always submits her work on time.
Here, 'pilna' relates to the matter being important and needing attention soon.