Your daughter is experiencing symptoms commonly associated with respiratory infections, such as chest congestion, cough, and a cold. These can be caused by viruses, allergies, or irritants in the environment. To alleviate her discomfort, consider using a humidifier, warm fluids, and over-the-counter medications like expectorants or antihistamines, which can help in easing congestion. However, if her symptoms persist or worsen, it is essential to consult a pediatrician for a thorough evaluation and tailored care.