Baby with a drrry cough, anything I can do to ease the pain?

My 7 mont old has her first cold, it's been a few days, she seems to be feeling better and she's less congested but her throat sounds soo dry. When she coughs I can just imagine how it must be hurting her. We are thinking about a room humidifier, as its usually pretty dry in this climate. but is there anything else I can do for her?