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I am Dr. Cami, and I am happy to help you with Daisey. Awe, poor girl, sorry that she is not feeling well. Some dogs can eat all types of foods and not have any problems, but others can be affected by just a bite or two of a food that isn't their normal diet. Two problems that come to mind are gastroenteritis where the stomach and intestines become inflammed, or pancreatitis where the pancreas becomes inflammed, both conditions may require medications to resolve. Since it has been more than a day since she has eaten normally, I recommend that she be examined by a veterinarian today. Regardless of what may be causing the issues, if she is not drinking much, dehydration can become a problem, especially in an older dog. Additionally, inappetance (not eating normally) can be an indicator of many other issues such as pain or internal organ dysfunction. A vet would be able to help sort out some of the possibilities, and make recommendations on the best course of treatment.
I am happy to answer any further questions you may have.
Good luck with your girl,