How does her breath smell? I went through this recently and it seems the determining factor was the bad breath that comes from the necrotic tissue in canker.
Do you see any fowl pox scabs on the combs, wattles, or faces of other birds? If you don’t see any dry pox scabs, it is probably canker. If there is pox, and I don’t see anything in your picture so far, it probably is not wet pox inside the beak.