What is the expiation for an oath sworn by a female friend that she would not enter the house of her relatives, and then she entered it after the harm had passed?

If someone breaks an oath, an expiation (kaffarah) for theath becomes obligatory: feeding ten poor people, or clothing them, or emancipating a slave. If one cannot find these, then fasting for three days. By your friend entering her relatives' house, she has broken her oath, and the mentioned expiation is binding upon her, due to the words of the Messenger of Allah, peace and blessings be upon him: "By Allah, if Allah wills, I shall not swear an oath and then see something else better than it, except that I will do what is better and release myself from the oath."