Despite all the atrocities committed by the enemies of the Ahlul Bayt (AS) in
Karbala, Allah (SWT) has protected all the members of the family of
the Ahlul Bayt (AS) so that no one can harm their sanctity and
dignity.

This fact was clearly mentioned by Imam Husain (AS) in his last will
to his sister Lady Zainab (SA) when he said that Allah (SWT) will
definitely protect all of you. ان الله حافظكن 

The enemies looted whatever they could loot from the tents and even from
the children, but no one could touch any of the noble women from the
Ahlul Bayt (AS). The compulsory Hijab of all the noble women of the
Ahlul Bayt (AS) was always preserved intact.

Some books mention of the veil being snatched away from the noble
women of the Ahlul Bayt (AS). Even if it proves authentic, it does not
mean at all that it was from that garment which formed part of the
compulsory Hijab, but can mean the extra cloth over and above the
compulsory Hijab.

Allah (SWT) did not allow the enemies to be able to expose any noble
women from the Ahlul Bayt (AS) even for a moment without the
compulsory Hijab

Wassalaam.