Nesta I, with sincere hopes that the child is recovering already,
I am sure the I had already tried all of the typical remedies for cold/cough?
+Onion, garlic, ginger, thyme, oregano teas
+High vitamin C
+Eucalypus and clove teas and facial steaming
+Hot damp cloth with eucalyptus oil on the chest
There is something else I use whenever I get a hint of a sickness coming on, and it knocks it out very quickly: colloidal silver in high ppm doses. Not sure if the I can find that where the I is located, but if so it's worth a try.
If it is a congestion issue, ear candles might also help. They draw out through the ear the wax and whatever is not easily draining out of the tube behind the ear.
I know it is heartbreaking to see the little one suffer. Health and strength to her and the I family.