Is calling a girl named Hafsa "Safha" considered mockery that expels one from the faith, and what should the girl do about it?

The principle behind changing the name of Hafsa or any other name is not to mock the name or the person named, but rather it is a playful jest for familiarity. This can be acceptable or detestable depending on the situation, the speaker, and the person being addressed. It is considered detestable if it is from a man to a woman who is a stranger to him, as it violates the boundaries of Islamic law and etiquette. Simply altering names is not considered mockery, and it is advised not to succumb to excessive scrupulosity in such matters.