Did the girl err in refusing to spend the night in one room with her father, his wife, and her sister, which angered her father?

You erred by disobeying your father in his command, because it does not involve any sin or hardship, so you must obey him. The basic principle is that a married couple should have an independent dwelling, or at least an independent bedroom. Your father must provide this for his wife, and he must be careful not to be alone with his wife's sister, for the Prophet, peace and blessings be upon him, said: "Beware of entering upon women." So advise him regarding this.