Where does a woman whose husband has died reside during the first days following his death, given the custom that places the mourning gathering at the husband's family's home, and does she complete her 'iddah in her own home thereafter?

A woman observing the 'iddah (waiting period) after her husband's death is obligated to remain in the marital home until the end of her 'iddah. She is permitted to leave during the day for a necessity, but she should not leave at night except out of dire necessity. It is not permissible for her to go out for condolences, because the general principle is that those offering condolences go to the home of the bereaved.