What is the ruling of the Sharia on the objection of the sister residing in the apartment to its sale and the division of the inheritance, demanding that it be left to her until she marries, knowing that she works and has money, and her siblings are in need of their share? And is her prevention of selling the apartment considered a sin?

The sister's not being married and her residing in the apartment does not prevent its distribution among the heirs according to their legal shares, whether she works or not, or whether she has enough money to buy another apartment or not. The brothers' request to divide the apartment contains no sin or injustice. If the apartment cannot be divided without harm and one of the heirs requests its sale, his request must be granted, and the judge will compel those who refuse.