She has a cold. She hates coughing and won't do it. I have to tell her to do it and threaten her with tickles. Tickles make her cough involuntarily and it's the only thing that really works, and she will probably hate being tickled forever because I've used it for evil.
Try your google-fu to find out what to do for a child who won't cough. It just isn't a problem for other people apparently. I keep envisioning a device that you attach to the face, squeeze and suck the mucous out.
The sound of her juicy cough in waiting... It just drives me bonkers! COUGH, child! COUGH!