Thanks for the posting your query.
Your daughter is most likely suffering from acute viral upper respiratory tract
infection, which is also known as Flu.
You should consult with internal medicine specialist and should go for thorough check up.
You should go for chest x ray
, complete hemogram and ESR.
(pain in legs) is a common symptoms of viral infection.
You should take cough
suppressants, decongestants, throat soothing and antipyretics.
You should also take muscle relaxants also.
You should also perform gargles three times in a day.
Dr. Mayank Bhargava