This is the 159th most frequent Arabic word.
إنها
"It is" or "she is."
Here, 'إنها' is used to indicate emphasis and confirmation of the subject being 'she'.
إنها طالبة مجتهدة.
She is a diligent student.
Here, 'إنها' contextualizes and emphasizes that it is indeed the specific time mentioned.
إنها وقت المغادرة.
It is time to leave.
In this sentence, 'إنها' introduces a statement that is emphasized to be a truth.