I don’t think anyone is claiming that there is a halachic prohibition of unmarried women having long hair. The issue is whether the school’s grooming and dress code is permittable by halacha (probably yes, schools of all ideologies and religion do such things), and whether the manner of carrying it out is acceptable by Jewish standards (a different question). As long as it doesn’t violate halacha, Jewish school can make rules (even arbitrary and capricious ones) , just like all other private schools – even if such rules are not required by halacha.
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