Well, it turned out to be not a food allergy.
The poor little angel had four fleas on her.
I noticed her attacking suddenly her skin suddenly with her claws and thought I had better check her out. I found four of the little devils on her when I combed her. Of course I gave her a bath right after...
We are going to continue with the new food, though. I don't want that to ever be an issue with Angel again and if we have her settled on something without wheat or corn, we will know to check her for fleas or such...
Found out the Megan had to treat their house on the inside because of their dog having fleas. Angel will be left at home the next time I go over...