ManolosandChoos, you have a very good point. How, indeed?
For instance, I started tweaking my (naturally) red color in high school, because it was beginning to darken and I liked my brighter copper color better. I had always had red hair, and my younger brother, also in school with me, also had it. I bet I could have flown under the radar of any "no-dye" policy, because my adjustments were careful and looked entirely natural.
I just don't see any way to enforce this school's policy fairly, because what is "distracting" is purely subjective. It will certainly be interesting if this gets taken all the way to federal court, which I gather is a possibility. Right now, accordingly to the family's attorney, all Hayleigh is asking is that she be allowed to return to her preferred hair color and that they take the first day absence off her record.
"Behold! We are not bound forever to the circles of the world, and beyond them is more than memory." J.R.R. Tolkien