Oh dear sost. She'll know more than she thinks but I don't suppose you'll convince her of that while she's in a state. Hope she calms down soon.
mmzz I've realised that my stress levels are highest for the subjects I know least about (Geography) or which I can't check against a mark scheme (English Lit). I am totally clueless about Geography having dropped it as soon as I could, and I feel like I'm going into an exam unprepared tomorrow! English was my degree subject but I can't see into DS's head to see how much he knows, it's not like science/maths papers which you can mark with the mark scheme and get an immediate picture of where they're at.
That said, DS has just talked through two of his poems with me and I was amazed by how responsive he was to the language. I think (hope) they know more than we think they do.