Amiga, Miss Lydia, Ravynscroft... thank you so much for your continued support. And thank you for the suggestions.
I have been using one of the treatments suggested by Majestic Waterfowl for two months and have no reason to believe the Oxine would be significantly different from the F10sc. I have used nebulization of properly diluted F10sc. This treatment has helped clear her lungs and the vet says they now sound quite clear. In other words, this treatment has been effective with aspergillosis in the lungs. I recommend it to others.
Unfortunately, this treatment has not helped the aspergilloma in her sinuses. (An aspergilloma is a solid mass or ball of aspergillus fungus.) This is probably because the F10sc (or Oxine) must touch the mold to be effective. In her lungs it was on the surface and therefore the treatment was effective. In her sinuses it is in a ball under the skin and not reached by the treament.
Recent operations have revealed that the aspergilloma, which at first was only in the front of her sinuses, has not only returned each time, but it now extends at least to the back of her sinuses. This means that everything I have tried (itraconazole, nebulization as suggested by Majestic Waterfowl, various herbs, and repeated operation to physically remove as much of the aspergilloma as possible) did not work to stop the aspergilloma from growing and extending itself.
The anatomy of ducks is such that the back of the sinuses connect to smaller openings (diverticuli) around the eye and brain and to air sacks in the head area. These openings are incredibly close to the brain - and an aspergilloma can cross that barrier. I don't want my duck to suffer that fate.
The situation at this time is... Cinnamon is clearly uncomfortable, worried and in distress. She strains to breathe, and has done so for nearly three weeks. She has grown to hate nebulization and other treatments to the extent she now runs away from me and will not even come for an earthworm (though she gobbled it when I threw it near her). The two latest operations have caused stress for her but no improvement. As a result, I am incredibly sad, but no longer struggling with my decision.
As the aspergilloma has been growing and extending further into her head in spite of careful treatment, and as Cinnamon is clearly worried and unhappy much of the time, I now believe the time has come to say goodbye to her. I fear that prolonging her life will only lead to suffering.
I will say goodbye to Cinnamon tomorrow.