Answer:
(Fatwa: 2112/B=1708/tb=1431)
According to Hadhrat Imam Abu Yusuf and Imam Muhammad (رحمهما الله) she should complete three menstruations as iddah besides three more menstruating periods i.e. she can marry other man after passing six menstruating periods. This is preferable ruling.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
