hi there
Look up tonsilloliths, aka tonsil stones. Has your DD had ear infections etc when younger? Or tonsilitis?
After a particularly nasty flu my ear got blocked for months (actually it was Eustachian tube). Because its ending comes out near the tonsils, the discharge congealed and set in the tube. Every few weeks (if lucky)I would get a little yellow blob come out in the throat, with that dreadful smell. Basically it's the same thing as plaque - remains of foodie bits and mouth bacteria and any ear discharge. Sometimes people say that they can see the white blobs attached to the tonsils and try to massage the throat from the outside to shift them.
This is what helped me:
Evening primrose oil (swallowed that is) and use of extra virgin olive oils - it helped to somehow "oil" the throat to let these blobs slide out.
Tissue salts (Holland & Barrets) - something on the lines of decongestants by New Era
Kali Bich (homeopatic pillules)
Blowing air into the ears, holding the nose closed
Putting saline drops (salt in water, like tears) down the nose
Cut out dairy as much as possible - for months
Cut out gluten when my son went gluten free - it helped to ease out more of these
Stretching the neck up - strangely these blobs sometimes come out when I am driving in a very upright position for a while, I have alos seen comments about some yoga position helping, cant remember which, but they were to do with stretching neck.
Well, with all this, my ear is now unblocked and the awful smell has gone. However, if I have a nasty cold it sometimes comes back - and I grab the tissue sals and most of the above again...
Hope it helps.