We have K4 through 2 in one building, 3-5 in another, 6-8 in the middle school, and 9-12 in the high school.
The system works well for us, especially because the fifth-graders have a system where they switch classes on certain days, preparing them for the same in middle school. The teachers are really gentle and watchful when dealing with sixth-graders, and there's also a discipline/reward program only for them.
My concern would be how your daughter would adapt to the organizational changes. My brother currently in fifth grade has been greatly helped by the "MS Prep," as they call it, and I think he may have been overwhelmed by the demands of middle school without the program. Maybe only having two years to fully work through navigating middle school and preparing for high school would be a problem with your child; I really don't know.
