What accelerated material will they be engaging her with this year? The answer to this is important, because I think that being told that you have to wait 1/5th of your life so far before you can get access to work that might be appropriate is a lot to ask of a young child. You definitely don't want her "checking out" or, worse yet, finding her own ways to make the classroom "more interesting"...Any chance she can just homeschool this year and go directly into the GT program next year? That assumes, of course, that the GT first grade will actually provide work that is at her level.