It could still be Canker. If you've started the Metronidazole, I would finish the course of treatment.Hi there, I was able to and it does look yellow ish on the roof of the mouth and one lesion. Still didn’t notice a bad smell. Have you seen anything fungal mouth infections? That is my only other thought. She defintley has difficulty swallowing. Thank you for your comment!
I'll tag in @Eggcessive and @dawg53 to see if they have other suggestions.
It is interesting that the skin seems to be overgrowing on the beak.