Lots of Things
The answer to this question is highly dependent on several other variables - your daughter's age, current health problems, history, type of cough, etc.
Anything from asthma
can cause a chronic cough
. Viruses, colds, infections can cause a new cough. Dry air can even cause a child to cough at night. Try a humidifier
in her room if you live in a dry environment.
Answer assisted by Danielle Jones, Medical Student