What is the way to deal with a sister who is engaging in an unlawful relationship online, knowing that she had previously promised not to return to it, and she works in a mixed-gender environment?

This matter is saddening and painful, and a Muslim is not pleased with indecency within his household. The act of a brother killing his sister or daughter upon learning of a relationship between her and a foreign man is against Islamic law. The ruling for someone who speaks to or exchanges messages with a foreign man is not execution. We commend your praiseworthy zeal, and we ask Allah to grant you success and guide your sister.

The causes that led her to fall into this wrongdoing must be cut off by preventing her from contacting others via the Internet and phone, and by protecting her from men. It is necessary to strengthen her faith and inform her of the ruling on such relationships and their danger to religion. It is also essential to prevent her from mixed-gender work and from leaving the house alone, due to the corruptions that result from that.