Am I permitted to donate a third of my mother's estate, which she bequeathed, knowing that she had gifted me her house before her passing, and that I was her sole provider?

The mother's will is enforceable to the extent of one-third of her estate and is to be disbursed before the division of the inheritance, provided that it is not for an heir and that the mother did not revoke it before her death. As for donating on behalf of the deceased, it is an act of righteousness towards her, and whoever performs it will be rewarded. The house gifted to you before the mother's death and your possession of it does not enter into the inheritance. Gifting a dwelling requires the giver to vacate it and not return to it for a period of one year. The heir to the deceased is the questioner, and she receives half of the estate, while the remainder goes to her sister if she is a full sister or a paternal sister. The children of brothers receive nothing. A note of caution: matters of inheritance are serious and complex; a mere fatwa is insufficient. Such cases must be referred to Sharia courts to verify all rights and heirs.