Really dumb rule, and the person at the school who was giving her a hard time was obviously on a power trip over a little girl. Shameful. There was nothing distracting about her hair in the least.
Reminds me of when I was in 8th grade. I went to a Catholic school and although me or my mom didn't know it at the time, coloring your hair was against the rules. Well, my mom let me get highlights at the salon and it looked really nice(I'm a girl). I got in huge trouble for it, didn't get sent home, but got detention and stuff, but they didn't mess with me too much, as I blatantly said I didn't care about the rule and it was dumb. But the next week like 3 more girls showed up to school with highlights, and after that the school hated me. Oh well. =)