It may come across as too agressive and insecure to bring along an attorney for a preliminary meeting to consider a grade skip if there is not a history of the school denying your requests or violating their own policies or the education laws. It would be more constructive to reasearch the policies and procedures for a grade skip to ensure that your DD will satisfy the requirements.
I was able to subject accelerate DS9 in math twice (in 2nd and 4th grade) without a single formal meeting. However, I did everything in writing (with the appropriate jargon) and I attached relevant documentation specific to math achievement and mastery that the school could understand. Of course, many emails and several phone calls took place as well. The school and the district also had to do their own achievement/mastery asessments to verify that DS was well past the level of his acceleration, but that part was entirely up to DS.
