Is it permissible for a widow to go out to work during her 'iddah (waiting period) in order to pay for her home and the home of her children, knowing that she was not working before her husband's death?

A woman observing the 'iddah (waiting period) due to her husband's death must remain in her home throughout the 'iddah period. She is permitted to leave for a necessity or a need, provided that she returns to spend the night in her home.