Well, my response must be based without doing my own examination. I would expect Sunshine to get more dehydrated over the next 12 to 24 hours, but I have no reason to suspect that the lack of water or food would be life-threatening.
If you were to observe any tremors, seizures, labored or open mouth breathing, then I would get in ASAP.
With her conditions, definitely, have a recheck blood and urine test performed to get an overall idea of her health. A vet may also want to give some subcutaneous fluids (under the skin) or start an IV if dehydration is more severe.
They can also start an appetite stimulant medication like Mirtazapine, but remember, that doesn't address the primary cause.
Ideally, I would prefer treatment sooner, but understand if you can't go.
Hope that information helps.