J.S.
I too was also going to suggest the humidifier and saline spray. Peppermint extract is also very strong and works like vapo rub-put a little between her lip and nose or on her chest.
update: My hubby just had my son in the dr. for ear and throat infection. She recommended rubbing his skin with apple cider vinegar. This is an old rememdy from her mom's native land but with a scientific basis. When the body is sick, it loses acid, which helps fight the infection. Rubbing the skin with the vinegar adds acidity and helps with the infection. Weird and smelly but worth a try.