It is too bad she does not like a bong. The condenser coil bong I bought from Smokewire gives a really gentle cool smoke that eliminates most of the coughing, but that does not sound like the right solution for her.

Did you ever get the vaporizer for her? Eliminating the black from your smoke does make it smoother and less likely to cause coughing, but I still see plenty of people cough even when they use a vaporizer. I sure hope it worked out for you.