Is it permissible for a woman to sell land and distribute its price between herself and her children, with the male receiving the equivalent of two females’ shares, and to donate the share of her deceased daughter as an ongoing charity on her behalf?

What a person does during their life and health by dividing money among their children is a gift (hiba), and the rulings of inheritance (mirath) or bequest (wasiyya) do not apply to it, provided there is justice among them by giving the male the equivalent of the share of two females. The deceased daughter has no share in this gift. If the mother wishes to give charity on behalf of her deceased daughter, there is no harm in that, and the reward will reach her, Allah willing, based on the hadith of Sa'd ibn 'Ubadah (may Allah be pleased with him) when he gave charity on behalf of his deceased mother, and it benefited her.