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<p>“According to D” may not be the full story. You don’t know what the girl’s true medical problems are. Perhaps she has something more serious but doesn’t want to share it with the rest of the class (which is, of course, her right). I sure as heck wouldn’t be encouraging my children to spread any word of any medical conditions they had other than on a strictly need-to-know basis. Anyway, I think you’re right, not to sweat stuff like this. You can only control yourself in this world, and there is so much more inner peace in realizing that, than in getting upset over what others do.</p>