I don't agree. Carrying proof of age isn't a requirement but if she has something then it's useful to carry in case the guard questions whether she should be travelling on a child ticket.
You don’t agree that they should carry proof of age but you then go on to say, basically, that they should!
There’s a world of difference between “should” and “must”.
I didn’t say they *must* carry it, I said they should, because:
Again no requirement to carry that but if questioned why not just tell the guard her name, her school and the name of the teacher who authorised the absence. If the guard is concerned that's enough information to check and if he/she does check and finds the information to be false then the police could be informed.
...yeah, if you don’t carry these things if they’re available then it causes bother and work all round. That seems silly.
Of course the OP’s daughter should carry these things. We know proof of age is available and it’s likely some proof of her reason for being away from school is also available too, and if it isn’t, the OP will deal with staff on the phone.
Seems eminently sensible.