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Sounds hot and stresses. Bring her inside and let her cool off, provide water. For not eating one day that is not a concern, keep offering it she will eat when she is hungry. Just like us sometimes in the heat they don't feel much like eating. I had a shepeherd that would eat one meal every three days. No matter what we fed. We took her to the vet and he said probably that was how she was fed and she has adopted the habit. Don't fix what ain't broke, she's healthy. But that poor dog would only pee/poop in the morning never again once in 24 hours. I could never ever do that myself much less expect a dog to do it. I took her out 4 times a day once for jobies the rest were for walks because she never did anything. Creates of habit and if that is interrupted sometimes they get stresses.