Good day, today my daughter woke up with a hoarse voice. It passed but…

Good day, today my daughter woke up with a hoarse voice. It passed but she coughs with phlegm as if it's a cold and her temperature was 37.5 now 36.8-37.2. I wanted to see a family doctor, called a nurse who says if there is some mucus but no congestion in the nose and saliva flows then it's probably on the teeth. Have you ever had such symptoms on your teeth, cough with phlegm heard from the throat like it's tearing, almost no phlegm, only when coughing and also saliva a little bit barely?? We don't have any teeth yet, I look in the mouth but can't understand what's