What is the ruling regarding money left in trust for the daughter of my deceased brother, and is it permissible for the guardian to dispose of a portion of it to give to the daughter's paternal aunt, knowing that the deceased enjoined that the money be invested to help his daughter in her unstable life, and that the daughter has only taken the annual profits from it?

If the paternal uncle's daughter is an adult and mature, and she disposes of her wealth by her own will, and she is not in debt, then her gift to her paternal aunt is valid and enforceable. This act is considered among righteous deeds and maintaining kinship ties. A mature woman has the right to full disposal of her wealth, even if her gift exceeds one-third, based on the Prophet's (peace and blessings be upon him) saying: "Give in charity, O assembly of women."