What is your guidance to one who wants to donate her inheritance from her deceased grandmother while she [the grandmother] is in debt, and to one who wants her share?

It is obligatory to pay off the grandmother's debt from her estate immediately, before its distribution, because the soul of a believer is tied to his debt until it is paid off. If anything remains after paying the debt, and she did not leave a will, then the remainder goes to the heirs, each according to their legal share, and they are entitled to take it. And whoever wishes to donate their share to their mother and make it an ongoing charity for her, this is an act of filial piety towards her after her death.