What is the Shar'i ruling regarding a married woman who has been working in a usurious bank for 20 years, and has become convinced of the unlawfulness of her work and wishes to leave it, but her husband threatens her with divorce, and her father threatens her with his displeasure if she leaves it? And to what extent is obedience to the husband and father obligatory in this situation?

Your friend must remain steadfast in her repentance from the unlawful work. She should remember that trials are part of this life and may be a test of the sincerity of her repentance. She must not despair, but rather increase her supplication and good deeds, for the reward for patience is Paradise. She must commit to not returning to work in usurious banks, as it is religiously forbidden. As for obedience to the husband and parents, it is obligatory unless they command disobedience to Allah; for there is no obedience to a created being in disobedience to the Creator. She should try to persuade them with gentleness and wisdom about the unlawfulness of this work, and prioritize Allah's pleasure above anyone else's.