Hi thanks for asking question.
Here only complain is fever.If fever goes above 101 and if it is not decreasing in 2 days
consult doctor.
If she developed
abdominal pain with vomiting then LFT done to rule out hepatitis.
If burning micturition present then urine examined for pus cells.
If consistent lower abdominal pain search for typhoid by
widal test.
If cough ,
sore throat present then it could be acute
viral respiratory infection.It is treated symptomatically like antihistaminic and do congestent.
Fever could be physiological like lack of sleep or excess heat can lead to feverishness.
If fever continuously increasing then detail investigation done with USG , RFT, LFT and complete CBC.
I hope your concern solved.
If still cause not clear and fever increasing along with other specific symptoms then you can contact health care magic for further guidance.
Happy to help you further
Take care