Thank you for your query,
Your child seems to have a viral illness.
What about the complete blood picture?
Calf pain may be due to muscle inflammation
which is seen in viral fever
Give her plenty of oral fluids.
Give adequate rest restriction of activity to get the muscle pains decreased.
Continue the medication as advised by your Pediatrician
Blood investigation for CPK may show muscle involvement.
So consult your Pediatrician for follow up visit and further treatment.
Hope I have answered your query.