LO's cough - any suggestions to help?

My LO had a cold about 10 days ago (her first), and while the cold seems to have disappeared, the cough has lingered about much longer.  It's a very dry cough, though it does feel like there could be some "gunk" still in her chest.  The doctor (about 7 days ago) said her lungs were clear, which was good.  We have the humidifier going and have put a little Vick's on her chest.  Any mom's out there with ideas on how we could help her out?  I know these things need to run their course, but she's waking herself up with her coughing fits and I just feel so bad for her.  TIA!