A: If a man dies, leaving his wife a widow, she must remain in her waiting period (`iddah) and in
official mourning (al-hidad) until her waiting period is over. If she is pregnant, her waiting period is until delivery, due to the following verse: "And for those who are pregnant, their waiting
period is until they deliver their pregnancy" [65:4]. This is also due to the established evidence from the Sunnah, specifically in the hadeeth of Subai`ah al-Aslamiyyah, whose husband passed away while she was pregnant and a few nights later she began post-partum bleeding and the Prophet, sallallahu alayhe wa sallam, permitted her to get married. If she is not pregnant, then her waiting
period is four months and 10 days, as Allah, the Mighty and Majestic, has said: "And those of you who die and leave wives behind them, they shall wait for four months and ten days…"[2:234].
As such, it is not permissible for this woman to proceed with the acts of Hajj until this period has come to term. She may then prepare for Hajj in the coming year, by Allah's Permission. We ask Allah to grant us and her success and wisdom. And Allah knows best.
And Allah, the Most High, knows best