Spending the money with the intention of joining her mother in the Waqf

Q: A woman had a house in a village known as Al-Sulamiyyah in Al-Kharj. She donated it as an endowment for her and her son who died before her. Then, she died and no one inherited her except her daughters and a paternal kinsman. One of the daughters is in charge of the house. Because the house needed restoration, she restored it entirely from her own money. She wants to join her mother and brother in the Waqf (endowment) for the sacrifice. Her other sister does not mind that. Is it permissible for her to join them in return for the money she spent on the restoration of the house? We appreciate your advice. May Allah reward you best and peace be upon you!

(Part No. 16; Page No. 112) A: If the money that was spent on the restoration of the house was not a donation from her and she spent the money with the intention of joining her mother in the Waqf, it is permissible to join them in the Waqf with the money she spent on it. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.