That's a really big jump. Was your DD reading a lot over the summer? It can definitely happen.
One thing to think about when your child's reading level is much higher than her grade level: In addition to reading, all the other subjects will have materials written for kids on grade level. So your DD may need more challenge than just in reading.
I would suggest setting up a meeting to discuss options based on your DD's MAP scores. Ask their advice about what to do to keep your DD challenged so that she is learning new things. There are printouts with the MAP by level, showing what a student at that level would be ready for. (I can't find the link at the moment, but I think inky's posted them.) It would be nice to find out where the other kids scoring at that level are; I would guess GT kids a grade or two up might be similar, otherwise several grades up.
