Mmm. Sounds to me as though you need to reverse out of the "math tests" lane, if you have any control, and go in a different direction asap. How about "This isn't a test, it's a practice sheet. That means it's supposed to be on things where you might get them right and you might get them wrong. If you get them *all* right, I've made a mistake by making it too easy for you, so I hope you'll get a few wrong."? Maybe not exactly that, but it does sound as though you might need to put clear water between you and her and the idea that making mistakes is bad.
Incidentally, does
See Inside Math really have the error reported in
the Amazon reviews? That's appalling, if so.
Might not be for right now, but if you haven't already do get a Murderous Maths book or two for having around. Lots of good maths, no long boring storyline involving school. (DS could cope with the maths at your DD's age, but didn't really get the humour, and thus start to get the whole experience of reading the books, until a little later. YMMV.)
One thing you might want to do now is back off arithmetic and do lots of geometrical things, magnet tiles tesselations, shape building, logic puzzles etc. I think if it were me I might even avoid mentioning that these things are maths, and just present them as their own thing.
