A 15-year-old activist on Monday morning walked into the school which has rejected her enrolment as "incomplete" and demanded her right to an education.
Thanalop "Yok" Phalancha, a Mathayom 4 student, walked into Triam Udom Suksa Pattanakarn School in Bangkok on Monday morning.
She wore her usual dyed hair and casual clothing, in defiance of school regulations.
She insisted on her right to an education, and rejected the school management's weekend statement that her enrolment process was incomplete. She said the process was completed on May 16, she had already paid her school fees and had studied there for a month.
She stood firm on her right to dye her hair and wear clothes of her own choice instead of a school uniform, and to not participate in school ceremonies.
Yok said her choice of hairstyle and clothing were a right, and the ceremonies were a reflection of authoritarianism.
However, she said, she would agree to wear a uniform if every student at her school also agreed.
The 15-year-old was recently released on bail from a juvenile detention centre in Nakhon Pathom, after she was earlier charged with royal defamation.
Last week, Yok showed up in school in casual clothes and with dyed hair. The school barred her from class. She then climbed over the school fence on three days, determined to attend class.
On Saturday the school issued a statement saying Yok had failed to complete the enrolment process, because her parents did not show up on enrolment day. It also said Yok's misconduct at school was a threat to the safety of fellow students, staff, parents and school property.
On her Facebook page on Sunday, Yok said she wanted to go to school but remained barred from entry.