What should a girl do who has worn the niqab without her parents' consent, when they believe it to be an extremism in religion and ask her to remove it for work to provide for the family's daily sustenance? Should she remove it or not?

The niqab is a religious obligation, and it is not permissible to obey anyone in abandoning it, even one's parents. The belief that faith in the heart and a good heart are sufficient for entering Paradise without deeds or adherence to the Sharia is a mistaken belief. True faith necessitates righteous deeds, and Allah looks upon hearts and deeds. The niqab is not an extremism in religion; rather, it is adherence to the limits of the Sharia. It is not permissible to remove it for work in a mixed environment except out of dire necessity, while attempting to convince the family.