Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
A husband is not obliged to bear the expenses of his wife’s Hajj even if he is rich. If a husband bears the expenses of Hajj of his wife it is considered as a favor on her and a good act.
A woman is herself obliged to perform Hajj if she is able to do so; otherwise, Hajj is not compulsory upon her.
Allah knows best.