Can a mother retain custody of her daughter after remarrying, knowing that the daughter wishes to stay with her mother and that the father is negligent in his religious duties? And can the mother transfer custody to the daughter's grandmother (the mother's mother) in the event the mother loses custody? And what happens after the daughter reaches the age of majority?

The mother has a greater right to the custody of her children until they reach the age of seven, provided she does not remarry. If she remarries, custody transfers to the next eligible person, and there is a difference of opinion among jurists regarding this matter. If she does not remarry and the child reaches seven years of age, then if the child is male, he is given a choice between his parents. If the child is female, there is also a difference of opinion concerning her. If the child reaches maturity and discernment, he has the choice to reside with whichever of his parents he wishes. As for a mature and discerning female, she is not permitted to live alone independently.