How to Ditch Your Fairy was slighter than her other books, but fun (Liar is my favorite of hers, followed by the co-authored Team Human, but writing this comment made me realize I have no idea what she's been up to since then...)

and my short-term memory for details is dreadful unless I've physically written the information down.

I do also try to write down short-term stuff a lot -- I think just seeing it in a visual format helps, and I'm pretty sure that the act of writing it does too. And now that you mention it, I think the weird recall knack for me is also for longer-term stuff -- or at least when I notice it, it's always something long term.