To tell the teacher that dd won't be doing the detention ?

[Wibblywobblyfoo]

Dd came home from school tonight saying that she has been given an after school detention, to be done on monday, for missing a bit of homework that was meant to be handed in today. She went to her lesson and they were all asked for their homework. She told the teacher there was none and the teacher logged onto the online homework portal and showed them the set work, that she had set at 9.30pm last night!
Dd is 14 and was in bed at 9.30 last night. We also have a no computers after 8.30 pm for them all during the week.
Is setting the work that late reasonable?

The only time I ever ask for sometbing due thr next day is if a student hasn't completed enough classwork and they've chosen to be lazy or silly.

Oh, and I tell all my classes that I expect cover worl to be to a decent standard so if at the end of their lesson it is less than they would do for me thry better take their books and make sure it is to my standard before i see their books again.

Definitely bring this up with the school.

If all but 2 children didn't do the homework, there's obviously a reason ie that it was set at a ridiculous hour the evening before.