Hi there. it has been the 3rd day that my 4 year old daughter says her ears close up what can be the reasom?

This most often means her Eustachian tubes (which connect your middle ear to your throat) are blocked. As ling as she is not complaining of pain, you can try some things at home to unblock them . She can try chewing gum or "popping her ears" by plugging her nose and then trying to blow with that nose pinched off. Increase in humidity may help, as may some hot tea with honey.Try meds ONLY by doctor