
If she's no better in the morning then I'd take her to the vet - don't bother offering food in case there's a benefit to her tummy being empty for any exam / tests.
24 hours starvation is pretty standard and if it's just a regular upset tum that is a sufficient period to let her inside calm down again and so gradually introduce small portions of bland food.
The fact that she is also now being sick sounds as though she may have picked up an infection or similar and possibly require meds.
Ensure she is still trying to drink and if you have any glucose at home put a little in her water. Severe sickness and runny bowels can cause rapid dehydration, particularly in the case of youngsters and warm weather.
HTH, please update when you can.
Good luck, Teri :)