Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.Forum.
Your niece, got operated for appendicitis
, on april 1 st, still she is getting low grade fever
. There was water in the lining of the lungs.It is called pleural effusion
, and suggests tuberculosis
I advise you to consult a chest physician for diagnosis and treatment. You may have to get the fluid in the lining of the lungs tested after pleurocentisis, besides other routine tests for confirmation.
The pain of the right lower abdomen also could be due to tuberculosis of the iliocaecal junction, that is to be operated and biopsy
done , for confirmation.
Wishing for a quick recovery .