Looks like viral infection, first you need to stop her vomiting you can give her syp Zofer 2 ml every 8 hourly, half hour after this medicine then you can give her water, milk or something to eat. For loose stool you can give sporolzc sachet one per day. Make her drink 50 to 100 ml of fluids each time she passes watery stool.
Next Steps
Keep watch on her urine frequency which should be around 6-9 times per day, if vomiting doesn’t stop consult nearby doctor