Normal body temperature is 98.6'F. If her temperature is well below it, its not fever
And in kids usually head has higher temperature than the rest of the body, which is attributed to
increased blood circulation in that region.
Also we may feel kid to be warm when our hands are relatively cold
If temperature is normal, activity is good and food intake is okay, do not worry.
If temperature is above 100'F even now and its the 3rd week of the illness, its better to have her investigated rather than changing the antibiotics.
A complete blood count
, CRP and urine routine will be helpful.
You have not mentioned other symptoms like cough
, cold etc.
Based on other symptoms, further investigations may be done if needed.
Hope my answer helps you.
Wish a speedy recovery for your kid.