ANSWER:

Taking her hijab off is sinful even without protesting. 

Taking it off while protesting is a sign of blasphemy as they are protesting against hijab and rejecting it which was mandated by Allah. 

https://islamqa.info/en/answers/112659/will-allaah-punish-women-who-make-a-wanton-display-of-their-beauty-tabarruj

Is it haram for women to protest and take of there hijab in public.

Women clothing | November 28, 2022 7:11 pm
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QUESTION: In universities there are specific uniform for girls, and there are co-classes. I want to ask that is Abaya is compulsory on the uniform. Or hijab is enough?
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QUESTION: Is it Haram if a woman decides after wearing a hijab for a long period of time she doesn’t want to permanently wear it anymore?