Thanks for your query.
I appreciate your concern.
Your grand daughter is having tonsillitis
is due to fever
Relax,continue with medication prescribed by your doctor.
Give her acetaminophen
every 6 hourly till fever is more than 100F,
Give her plenty of fluids ,lukewarm water will be soothing for throat.
Give simple bland diet to maintain proper nutrition,
Your child will be fine in few days,