If you've got white spots (pustules) on the back of her throat, I'd be willing to bet $20 that the long test comes back positive. $50 if her breath smells metallic.
Tonsillitis is just a catchall phrase (literally meaning swollen tonsils). It's applicable to strep throat as well as any other creepy crawly that makes them swell up, viral or bacterial.
If she's capable of gargling without swallowing, have her gargle saltwater. Strep is halophopic...can't exist in salty environments. If she swallows the saltwater though, it will make her vomit...so it's not worth it, if she doesn't gargle yet. Chloroseptic spray will numb a painful swollen throat as well. Keep an eye on the dosages though. You don't want to over do it. Other than that...just the standard care for any illness...
- Keep the fever down (tylenol, ibuprofen)
- Hydration (she should be peeing at least once an hour and clear, water or juice or even clear soda if the bubbles don't burn. Obviously, water the most, but the juice/soda will give her badly needed sugars. The salts in soda are actually helpful in this case. I wouldn't do pedialyte/gatorade though unless she's vomiting or has diarrhea)
- Chicken broth (or other high protein/high fat broth...for energy and building blocks for antibodies)
- Rest
- Cool compress if her fever spikes on the nape and over her eyes, to help pull out the heat.
- Mommy love and patience