Yes colley as the op has said serious condition your parents or your attitude to minor illnesses is irrellvent! I'm presuming you do know the difference between serious and minor?!
Just to add my voice too the children can be up and mobile and seem well enough to be out but that doesn't mean they should be at school. My friends child had very bad accident over the summer holidays, ended up with pins in his upper arm. My friend phoned the school on the inset day explained the situation, as the hospital had said it was fine for him to return as long as the arm didn't get bumped. Fine the school said. My friend takes him to school, on the first day back, carries on to work, five miles down the road my friend gets a phone call, "can you come back and collect your lad, we can't have him on the premises with his arm like this."
So colley and theycall, well enough to be at school told by medical professionals that it's fine but the school refuse him access? Was my friend unreasonable for turning round and collecting the child when the schools insurance wouldn't have covered the child if something had happened?! What should he have done when he picked his son up made him go to bed and lie in the dark when he wanted to go to school!
Sorry op, just annoyed at those two responses, honestly as the school are aware I wouldn't worry about hoiky pants parents, your child isn't playing sick, she needs fresh air and the cabin fever will make both you and her short tempered.