>if she's aware that happens every month

It's not like a pre-scheduled thing. Teenagers have incredibly unpredictable cycles, even more so if they have any gynaecological condition.

If it's PCOS it often happens unrelated to a period, as cysts usually occur during ovulation.

I've been a manager in fast food, it really does suck to have to cover shifts on the fly but it is the most crucial part of the job. That's why hiring is so important, so that you get people who can cover gaps in a short notice.

And 5hours isn't even that bad, our industry agreement says 1hour notice is all casuals have to give.