Hi dear,
1.
Dry cough occurs with dry throat,so keep her sipping water or tea all day and when she gets cough bouts drink.
2.Hot drinks.
3.Lozenges-Sualin 1 tablet resolve 4 times a day.
4.Take steam inhalations(1 teaspoon of baking soda for 2 glasses of boiled water).
5.Nasal decongestant-
Otrivin 2 drops twice a day daily.
6.Continue antihistamines, it can be used daily at night.
7.Kuka syrup 1/2 teaspoon twice a day for 5-10 days.
It seems she has viral infection,it can take 1-3weeks,she will get better ,don't worry ,just use remedies.
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing your child good health.