Suggest Remedies For Recurring Cough

Good afternoon. my daughter has been couching for several days. It is not constant just at random times during the day. Shes been coughing for at least four days. I haven t given her any couch medicine because we tried different cough medicine when her and her brother coughed last year and the medicine from the store did not seem to help. what way can I help my daughter get rid of her cough? It sounds rough as if congestion or maybe mucus in her lungs or throat. She does not have a fever and has been normally active each day