Drooling and excess salivation. Advice.

Help doctor. My daughter who's 4 drools in the night. She does have a bit of an allergy and nose blocks sometimes. We used to treat her with montair lc for almost a year. But it's not bad now. Of late, I have seen excess salivation while she speaks and she plays with saliva in her mouth. It's not drooling but there's definitely excess. Her growth is normal. She talks non stop. Her speech is normal. No other health related issues except digestive problems once in a while. She's good at school too. Her lips don't seem very wet either. But sometimes there's saliva when she speaks. She says there's saliva that comes when she speaks sometimes. Her teeth is normal. I wanted to check if I should worry, if this is a neuro condition or can I wait a while to see if it gets better. Do advice. Thank you