What is the ruling on a brother opposing his sister working as a nurse in a hospital for a better salary, instead of working part-time in centers for a lower salary, and what is the ruling on his interference in her financial affairs?

A woman's work is permissible within the bounds of Islamic law, especially in nursing, due to the need for it. Islamic law does not prevent her from returning home at night if she feels safe. The notion that her abundant wealth or academic advancement might delay her marriage is incorrect; rather, men may desire her for her wealth and religiosity. Your brother's words might stem from compassion, and you should pray for him. Shunning him is permissible due to his harm, but it is better to consider what is most beneficial. If your father forbids you from working, discuss it with him respectfully and seek help from someone who can influence him, and supplicate to Allah to facilitate convincing him. If he insists on preventing you, obey him, unless you are in need of work.