They used the STAR test. I think it was the same problem as Kerry mentioned.

Still investigating. I am meeting with her teacher after spring break.

Also, I do think DD has been concentrating a lot on music lately. Her piano teacher mentioned that she thinks DD is having a huge cognitive leap- she is playing some challenging pieces very well. Also, her sight reading has soared. She is intrinsically motivated to practice right now, and probably spends more time at the piano than reading books. So that may be part of it as well.