I don’t know why your vet put her on that strong antibiotic if she tested negative for parasites/bacteria. it could only cause more side effects such as vomiting and diarrhea. Since she was on a chicken/rice diet and did well then it has to be the kibble causing the upset. Melinda mentioned Stella and chewys which I also feed. They now have a grain inclusive kibble also. My one dog had digestive issues and does great with their kibble. Introduce SLOWLY to the chicken/rice. Also beware of prescription diets . Not all what they’re cracked up to be as study states below.
https://www.dogsnaturallymagazine.com/calling-bullhit-prescription-diet-dog-food/
