CFK,
There is the softer side of me who agrees with you. I hate seeing my kids struggle. However, as the parent of a child with a similar IQ to Samson's daughter I would be tempted to keep her where she is. My son is now in fourth grade after skipping first grade. He is still miles ahead of his class and at this point has really only learned to be lazy and as Grinity said, think that any mental effort required means he is not smart. Many many ND children struggle with school but parents do not jump them down a grade to make it easier. They accept that their child needs to learn to work and achieve in the environment they are in. I would let it play out.
You say "She is only 6 and there is time for more later." I say that when later comes it is likely that she will be unwilling to do that "more". It sounds like she likes school, likes her friends and has the support of teachers and parents. Her needs seem to be getting met so I would help her work through this unless she appeared to be unduly stressed. A little stress is okay...it is a motivator and is part of life.
