Bulldogs World

I posted before about Ella itching and wanted to update.  She is miserable :(. I changed her food to Taste of the Wild, grain free.  I got the puppy/salmon version.  She gets Apple cider vinegar, salmon oil and yogurt in her food, and no other treats.  I know it will take a while for the new food to help, she's been eating it since 1st of January.  No fleas, I took up a wool carpet the vet said could bother her, her bedding and everything I wash is with a hypo-allergenic soap.  She will sit with my husband and want him to scratch her back, and cry if he stops.  I have bathed her with Virbac Keto-Chlor hoping to give her some relief.  I have some Virbac Allermyl and Resicort that I'm going to try but I don't want to bathe her too much either.  her skin is real pink, and she occassionally has little bumpy areas, but no hot spots, she just frantically chews herself.  She is getting an antihistamine but that doesn't help much.  I realize this will take time, with the food.....but I feel terrible for her!  Am I doing anything wrong?