Welcome to the forum. You have not given any past or menstrual history. However, I will try to help you. Your daughter is suffering from infection ( viral/ bacterial ) that is causing fever
, bodyache and headache. Consult a doctor get her clinically assessed, get blood tests ( R/E, C/S), blood for mp and widal test
to rule out malaria
There is no harm in doing blood tests since she is febrile since a week. Depending upon the diagnosis she may need urine, stool tests to be done.
Give her light, non-oily food, keep her well hydrated. Include berries, fruits and veggies in her diet. Take care.