Thank you @NotDonna .
Yes, she does have a diagnosis. The school's SENCO has been extremely unresponsive (that's a different story, but it's nearly finished me off!) but there is a new team this year. This is good in that they seem more on the ball, but bad because they don't know her. Individual teachers are much better and they do get back to me if we have any queries. However, DD masks, is well behaved and is bright enough that she just about gets by in class, mostly.
That's exactly it, she understands well enough but cannot recall when necessary (sensory/emotional dysregulation makes memory problems worse on a bad day, which you cannot predict).
She has been revising with the text books, which we bought her so she can highlight, and has been making mind maps & flashcards. She is doing hours of work most days and we thought she'd cracked it. But then we saw the cards and they are too detailed, not a quick summary. It turns out she is making up the questions (rather than use the workbooks) because she thinks it's cheating to copy them! That's ASD honesty for you...
So we plan to spend the half term helping her going through one lesson, then highlight, then take notes/do mindmaps, then use the workbooks to answer questions. I personally think she's got enough just going through the workbooks, where all is in one place. Too many sources is a nightmare for her. Which I get!