Q: Can a lady performe haj during menstruation?
A: All the acts of Hajj can be performed during menstruation, i.e. Wuqoof at Arafah, Muzdalifah, stoning, etc., except the Tawaaf. Tawaaf, be it Ziyarat or Widaa', may not be performed in the state of menstruation. The woman will have to wait till she is clean before performing the tawaaf.
Tawaaf and entering a Masjid in the condition of menstruation is not permissible.