Laniakea - is there a second paper to sit? My DD's first exam was hard, but the second paper in the subject was much better.
error (waves) good luck to your DD for all her exams, hope some good questions come up in witchcraft! Luckily DD doesn't worry too much about exams, but a nasty first paper unsettled her. Her exams are spread out over 40 days, so hopefully that gives her plenty of chance for revision and a few breaks.
Nico, that's awful for your DD. She doesn't sound well enough to be sitting exams. As others have said speak to the exams officer. I'd get her seen by a doctor or school nurse at least, so you have medical backup if she can't sit an exam.