Keep your child hydrated at all times with warm water. On top of that you may want to boil snow pear for her to drink once a week to keep her cool inside. On the western side you may want to invest on a nebulizer and have her breathe on everytime she sleeps. Once a day is fine.
Experiment the above for a few days. If the cough dont get better please consult the pedia ya
Hope this helps!