Cennet Doganay was banned from classes for wearing a headscarf as it went against the new law against religious signs in French schools, introduced this term.
"I will respect both French law and Muslim law by taking off what I have on my head and not showing my hair," she said at school Friday.
Many Muslims believe modesty requires women to cover their hair in public.
The issue of wearing the hijab, the Muslim headscarf, has sparked has sparked controversy across Europe. France decided to ban all religious symbols in state schools, including large Christian crucifxes, Sikh turbans and Jewish skullcaps.
Schools were urged not to automatically exclude pupils who arrived wearing headscarves, but to try to avert a showdown through dialogue.