But why hadn't she gone at break
Because periods don't run according to a school timetable.
There have been times in my life where I could predict my period starting to a day and time but even so, it was heavier at the start and I needed more frequent bathroom breaks because of it.
And other times when it could start almost without warning and once it did I had to stay home for two days because I've been bleeding so heavily I was soaking through pads every twenty minutes and passing clots the size of my thumb.
At the moment, I think because of my COVID vaccine, my periods are unpredictable, heavier, with more clots, and they have me feeling dizzy, sick, and with weirdly numb but still painful aching in my legs. I'm working from home at the moment but even at work, we can go to the toilet as and when we need to, whether that's three times in an hour or once all day.
I appreciate that kids can take advantage but being prevented from using the toilet when they need to, on the assumption that they can wait longer, should have gone earlier, or don't really need to go, it just isn't right.