Just goes to show how different kids with AS can be. Many would be totally freaked out about missing some points.
I think your decision about letting it go or not should be based in part on whether asking her to raise her standards will raise her anxiety past a tolerable level.
In principle it's good to encourage "do your best work," and looking over and correcting are important skills. (Does she make the same errors in pencil/paper math? The computer isn't an inert tool; it changes the game.)
My DS (9, AS) generally whizzes through work he doesn't like, often with sloppy results; I have hovered over him to slow him down, and I urge checking of work, in hopes that this will eventually be internalized.
We also talk about a scale of "poor... OK... good... excellent" and have him examine his output to see where it falls on the scale. His self-concept doesn't match reality sometimes, and IMO it's good to have him check in with other people's standards for what constitutes adequate or excellent work. So far this has not made him anxious, so we're all good. If he became too anxious, I'd tone my process down.
HTH,
DeeDee
