What is the ruling regarding a woman who died before performing the obligatory Hajj, even though she was financially capable, but she was not married and her father was of the opinion that her Hajj should be performed with her husband?

Among the conditions for Hajj to be obligatory upon a woman is the presence of a Mahram or a husband. If she meets the conditions but does not perform Hajj without a valid excuse until she dies, then it is obligatory to deputize someone to perform Hajj on her behalf from her wealth, even if she did not make a will. This is based on the analogy of the Hadith of the Juhayniyah woman whose mother died without performing Hajj. So, whoever dies with an unfulfilled Hajj obligation, it is obligatory upon their guardian to equip someone to perform Hajj on their behalf from the principal of their wealth.