YANBU
I completely forgot our year 10 parents GCSE evening, from reading the slides it didn't look exciting. (and I'm normally a terribly good parent at attending things).
I have a totally NT, but unbelievably suborn Y8, I pray she continues to want to do well at school because no intervention from me will have any effect if she doesn't.
Chill, wine, GP if eyes don't calm down with a good nights sleep.
Then arrange a meeting with the school senco. If your DD is an A grade student she should be able to get passable grades even if she doesn't do a huge amount of HW or revision, so long as she has been in the lessons.
You need a plan to make sure she keeps going to school and you need all her teachers on side (always the difficult bit).
Does your DD know what she wants to do? Having something to aim at really helps.