She can continue with Ayurvedic medicines. With that start doing YOGA- breathing exercises, pranayama,surya namakara and certain specific yogasanas done on regular basis will give a lasting solution .Certain precautions has to be taken from getting exposed to dust,pollen,smoke etc by using a mask , drink only warm water. Avoid cold,chilled food n drinks.Keep ur chest n extremities warm in cold weather. Yogic cleansing techniques like jala neti,sutra neti,vaman dhouti will also help. 1 or 2 courses of acupuncture can also be done for general immune boosting and to strengthen the respiratory system.