Is a wife sinful if she did not inform her husband about money her mother gave her, fearing he would take it from her and spend it on cigarettes?

A woman has her own independent financial standing, and there is no harm in her concealing her money from her husband. You have done well by concealing it, fearing that he might ask you for money to buy the forbidden cigarettes, because cooperating in sin and aggression is prohibited. As for a mother's gift to her daughter, there is no objection to that if the woman has no brothers, or if the gift is for a valid purpose. Otherwise, it is not permissible for parents to favor some of their children with gifts over others unless there is a legitimate reason.