This story was on the front page of our newspaper today. The girl wants to wear her shirt to school, but the administration says no, due to a rule about disruptive attire. They've handled cases like this before, and have always won. The Confederate flag is undeniably polarizing and divisive here, and the school feels it is in the best interest of everyone to not allow Confederate attire.
I read comments by her and her relatives, and although who knows how the media twists things around or misrepresents, it didn't seem as though they were concerned about 'heritage' issues or 1st Amendment rights. I could be completely off base, but it sounded more like a "you can't tell me what to do" issue--their arguments weren't particularly convincing or impressive.