"You may also wish to read up on advocacy... having a general plan in mind"

I have been reading about advocacy - thanks to this site and others. I feel paralyzed though. We haven't know for very long that our daughter was gifted so I am not yet comfortable with the idea of having these conversations with the school. It kind of feels unreal to be contemplating an acceleration. I really don't know what will be appropriate for our daughter.
I tried to pin the teacher down as to what level she was doing and she had a very vague answer that it was a bit of 4th and 5th grade.
What do people do to find out exactly where a child should be placed? Our child was 99th% on the Iowa and the Cogat, but that just tells me that she did well, but not what grade work she can do. Ideas?