There is no easy treatment for aspergillosis. It mostly consists of removing the source of mold. Many things could cause yellow plques inside the beak, such as bacterial, fungal, viral, and protozoan organisms. Many who have treated canker say that it smells very rotten. Your local vet may be...
The acidified copper sulfate may be used alone in the water 1/4 tsp per gallon of water for 3 days per month to help prevent the spread of canker, a protozoan disease carried by pigeons.
If using the plain copper sulfate (not acidified) it has to have some acid added, such as citric acid or I...
You will probably need a second pair of hands to look into her beak. Vet rx is camphor, similar to Vicks Vaporub, plus rosemary, oregano, and pine oil. I have never used it, although there are many who claim it helps.
If it has not responded to Tylan or Baytril, you are probably dealing with a virus or possibly a fungus. Is she able to drink water? Have you looked inside her beak with a flashlight for any yellow or whitish-grey patches? There also might be mucus near her tracheal (airway opening.) It sounds...