The building change happens in grade 6, that is also the year that the gifted magnet program ends. Since her program is a magnet school, it is actually 15 - 20 miles out of the city in a nearby town, so any need to change schools during the day would not work - it takes about 1/2 an hour to get back into the city because of traffic.
There is 1 gifted middle school program, which I have heard mixed reviews about, but I'll look into that next year.