Crp is not that reliable test. It may be high in a simple viral infection or may suggest a bacterial infection.
-Fever for 3 days is okay.
-Inbetween the fever, child should be active.
-Child should be active. No change in behaviour like lethargic or irritable in absence of fever
-Child should be taking around 1.5 litres of water
-Urine frequency should be adequate.
Encourage more liquids like ors, lemon water, coconut water to keep her hydrated.
Don't rely on test alone, important is the child and her activity.