Warm liquids, like mother’s old-fashioned chicken soup? Cures everything, I’m told, Seriously, anything she’ll tolerate that has nutrition in it. You have to be in close contact with your doc, because she NEEDS calories, which can be gotten in things like regular jello mixed with water but not jelled, regular soda, warm milk, broth or any other liquid, BUT her BGs are likely to go up even if she doesn’t eat at all, which brings the dangers of ketoacidosis. Which is why you have to be prepared to feed her and give her as much insulin as needed, but better to have the doc’s advice on how much. Do you have a CDE or a dietitian? They would be a very good source of information, too. And be sure to have glucagon on hand just in case she surprises you and BGs go down.
As far as pain, aspirin is a no-no for children because of Reyes’ Syndrome, which can be fatal, and, again, I really think you should ask your doc. I’ve had strep, and it IS very painful, and it really hurts to swallow, so maybe your doc can give you a safe painkiller. I’m surprised he didn’t do that last night!
Good luck with this anxiety-provoking problem – I hope she gets better fast!