Will a mother be sinful if she abandons her daughter—who mistreats her and causes her health to deteriorate—and does not include her name in her will, knowing that the daughter is well-off?

The mother's right is great, and honoring her is among the most obligatory duties, while disobeying her is among the greatest sins, especially during her weakness and illness. It is not permissible for a woman to mistreat her mother. One must have a good opinion of a Muslim woman and seek excuses for her. The woman should be advised and warned of the consequences of disobedience. It is absolutely not permissible for the mother to boycott her daughter, and it is permissible to refrain from responding to words of blame and injury. A will in favor of an heir is not permissible unless all heirs approve it.