What other symptoms?
sore throat, ba breath,nasal congestion, lymph nodes, white spots, problems to swallow nausea, vomiting, headache?
If no other symptoms, only swollen tonsils and you gave her Omnicef, the infection has gone.
You could try this:
Gargles with warm salt water: 1 teaspoon of salt in 8 ounces of warm water several times a day.
Benadryl liquid with Dexamethasone: 1 tsp three times daily.
If symptom, swollen tonsils, remain more than three days, you must go the doctor.
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Most cases of tonsillitis are caused by viruses. After an inflammation of the tonsils, and after treatment the tonsils remain a little bigger. Those remedies are for reducing the swollen tonsils. She could not gargle, but you could put the water in her mouth.
Most of the tonsillitis go away in 7-10 days, if she is not having other symptoms and she is eating and playing as usual, you don't have to worry.