Is she sinful because of her harshness towards her mother while she is under sorcery? And is what the Jinn sees true, that her mother is displeased with her and that she will be deprived of her in Paradise? And what are the deeds that would please her mother with her and enable her to reunite with her in Paradise?

If the questioner hit her mother by choice, she is sinful and has committed a grave sin, and she must repent and seek forgiveness. However, if she did so under the influence of magic, then there is no sin upon her. She must put her trust in Allah, persistently supplicate, recite the Quran, engage in remembrance, and perform ruqyah (definition) (exorcism according to Islamic law).

The interpretation of her dream that her mother did not die and that she is a martyr is plausible.

Performing ongoing charity (sadaqah (definition) jariyah) for the deceased mother is a form of righteousness and benevolence. Among the rights of the mother after her death are: supplicating for her, maintaining ties with her relatives, and performing Hajj and Umrah (definition) on her behalf.

Whatever wealth the mother left behind is subject to the rules of inheritance. Rights and bequests are fulfilled from it, and then the remainder is divided among the heirs.