Answer:
In the name of Allah, the most Beneficent, the most Merciful.
If it’s an obligatory Hajj then it is not necessary for the wife to take permission from her estranged husband as long as there would be a Mahram accompanying her. If it is an optional Hajj then permission is required. (Kitabul Hajj p.14)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham
