This is the 49th most frequent Arabic word.
أنها
"أنها" means "that she" or "that it" (feminine).
The word 'أنها' ('that she') is used here to indicate a statement emphasizing the subject 'she' performing the verb 'enjoys'.
أنها تحب القراءة في وقت الفراغ.
She enjoys reading in her free time.
Here 'أنها' ('that she') links the statement 'I believe' with the prediction about 'she' arriving soon, showing belief.
أعتقد أنها ستصل قريباً.
I believe that she will arrive soon.
In this case, 'أنها' ('that she') connects the description 'it was clear' with the subject 'she' being happy, specifying the observation.