Fever since last 12 days in 8 years girl

Dear doctor , my daughter is 8 years old and has been suffering fever for last 12 days, particularly in NIGHTS. On day 1, we took her to physician and he gave paracitamol, and citrigen for 4 days. We used the same, but still the fever was not gone and continued the night temperatures. On day 5 we took her to Paediatrician and he  told that not to worry, sometimes the viral fever may continue for 1 week. On day 8 there was still temperature is above 100 and we took her again. Then the doctor send her blood samples for CBC, Malaria and Dengue. The reports were negative. All the values are normal. We came back to home and on the day 10 it was still around 99 temparature. this time We changed the  the paediatrician .  After this all narration the new paediatrician changed the medicine and advised to use the same medicine for 4 days. Today is 2nd day. But still the temparature is almost 98 around specially in Nights only. Day times the temperature was normal. Pls tell us what to do