Is Mahram a condition of Hajj being obligatory or a condition of performance

Is Maḥram a condition of Hajj being obligatory or a condition of performance?

Question

A woman has enough money to go for Hajj but is unable to travel as she does not have a Maḥram who can accompany her. Later, this money is spent. She now has a Maḥram available to accompany her but she does not have enough money for Hajj. Is Hajj still necessary on the woman?

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