My Dd has really just gotten over it now. She had it for a week and a half, and was living off basically nothing. She went on AB's that she was allergic to, so came out in a fully body rash and had to be taken off. The giveaway sign to remember is really rancid breath.
My little girl was just so sick, you could see the puss in her throat.

I hope your DD improves soon, but remember it does take a while. Just offer juice, even if it is something you wouldn't normally give. THey are more likely to drink it