OP here. Thanks for the responses. It's so dispiriting that I feel I have to arm myself for battle every time I have one of these meetings rather than going into a collaborative meeting in which everyone wants to work together to find a way my daughter will learn best.
I have heard about the flurry of those seeking IEPs in early high school for college testing purposes. Well, that was a tiny part of my motivation (I actually began trying to get services back when DD was in fourth grade!) but mainly I want her to do well enough in high school that she'll have choices beyond community college when she graduates. She has the ability to do college work, it's just that classroom tests, finals and SATs won't show that I fear.
Anyhow, for anyone looking for an easy-to-understand comprehensive explanation of how IEPs work, go to
http://www.riverbendds.org/index.htm?page=iepguide.html. It's for those with Down Syndrome, but the explanation works for all disabilities, I think.