D.B.
I agree to call the pediatrician. Your kid is pretty sick and you need to check in with the doctor who knows her best. Don't be afraid to use the "after hours" line for advice - that's what it's there for. You'll get much faster advice too, than putting it on an internet forum of amateurs and then waiting and waiting for responses.
The other person who is your friend is your pharmacy manager, who has some records on your child (assuming she's had meds over the first 2 years of her life), and who knows the over-the-counter remedies available.
Diet - skip dairy, as it creates more mucus and can be tough to digest. Soft foods like applesauce and bananas can be easier on a sore throat, also jello and popsicles and chicken soup just to keep the fluids going. And water water water - vomiting increases dehydration.