بسم الله الرحمن الرحيم
(Fatwa: 1940/1414/H=12/1434)
The iddah is over if she passes three menstruation periods or delivers a baby. It was sin not to follow all the rulings of iddah and it is necessary to do true taubah and istighfar. However, if she passed her iddah, her nikah with any other man will be valid.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
