Lovemydd - that meeting sounds good. I hope that the teacher will stick to it. In my past experience the teachers would make promises and then the school would find out and make them retract the differentiation (yes this is a gifted school we are talking about) for various obscure reasons.
You will probably see the teacher raise the bar bit by bit and your dd will be expected to happily comply. What you could say in a few weeks if this is what's happening is something like "thank you for the alternatives you are offering, it is helping indeed. DD is excited to get to *insert maths problems of choice here* and we felt confident in assuring her that you will help her get to where she is capable of working."
Esp when you are getting the right responses you want to guide those to the best of your advantage.
