What is the ruling on a mother and her daughter going out to a relative's house after the husband's death, and the mother leaving her daughter there to stay up late with girls her age, then the brother is sent to bring her back, knowing that there are young men in the relative's house?

A woman observing the 'iddah (waiting period) after her husband's death may go out during the day for her needs, and at night if necessary, such as visiting her immediate neighbor for companionship if she finds no one else to keep her company. However, it is forbidden for her to spend the night outside her home. It is not permissible for her to go out to visit relatives or for other non-essential reasons. As for leaving her daughter with young men for socializing and conversation, this is forbidden due to the corruption and temptation it entails.