We had the best success when we went in asking for their help, as in, "We have these crazy high test scores, and we're not sure what to do. Do you have ideas how to meet DC's needs?" (Of course, it helps to have some test scores, or a portfolio of things that your DD can do.) If you can make it a team effort, and offer suggestions, that may help.
What is it that you want for your DD? I would suggest making a list of the things you would like, and why, so that you can refer to it if things start heading a different direction.
