Posting for traffic - 12mo and tonsillitis?

[SideEyeing]

Hi there,
Apologies for another panic post. Being a first time mum during a pandemic is clearly not my forte.
DD (12m) was diagnosed with tonsilitis after a call from nursery on Thursday saying she had come down with a fever and was lethargic. She'd been fine that morning, if a little grizzly. She was given a prescription for pencillin and seemed fine by Saturday, no more temperature. We've had another call at work today asking to collect her as after her nap she'd developed a temperature of 39. We've got a covid yest booked (the one from the day of the tonsillitis diagnosis was negative) but it's stressing me out that she's been on antibiotics for five days of a ten day course and now has another temperature. Please talk me down - is this normal?
She's okay within herself - eating, nappies etc. When the calpol is in her system she's her usual hurricane self but when it wears off she's pretty damn feeble and unhappy.
Argh.

IME, tonsillitis is a bugger for causing high temperature.
My dd gets a (normally viral) tonsillitis every time she gets a cold and spikes high temps like that (her tonsils are too big for her head, I reckon!) If it's bacterial, it may be that she will spike temperatures and it will pass when she's finished the antibiotic course, or she may need a different antibiotic.

When dd was a similar age, she got tonsillitis which turned into a chest infection and an ear infection all from the same cold, it seemed her immune system just couldn't deal with whatever bug she had caught. If I remember rightly, they switched her antibiotic from amoxicillin to co-amoxiclav and that seemed to do the trick.

I would speak to the GP again tomorrow - it's good that her temp is controlled on calpol and she's fine when her temp comes down.

Hope she gets better quickly. It's a shame they can't swab her tonsils at the same time as the covid swab to find out if it's bacterial or viral.