Yeah, an allergy to those ingredients in highly unlikely.
An intolerance to something in the recipe is possible.
I think that sweet potatoes will be good but have my doubts that it will fix the problem.
It seems like she really needs a biopsy but I wouldn't go there too fast either.
We are at the same spot with Ellie.
The omega 3s should be good.
How about Metronidazole? Tried that yet?
Prednisone is terrible stuff.
How are her sodium and potassium?