Hi, Lisa. I think I'd send some combination of the following:
* Explanation of each accommodation with an explanation why it's necessary, in case she's not fully up to speed
* Quirks of my son that might not appear in the paperwork, but would be good to know
* Lessons learned from prior years
* Information on what he's been doing over the summer and what he did last year that might help her to understand your son's advancement
* Full contact info for you at work and home if she might not already have it, with stress that you are always available if anything comes up
* Volunteering to help occasionally with class
