Answer:
(Fatwa: 972/D=229/File D=1432)
At the time when she did not become Sunni completely and held some Shiite beliefs like Imamah i.e. Imams are innocent, Hadhrat Jibrail (عليه السلام) erred to deliver Prophethood, slandering Hadhrat Ayesha (رضى الله تعالى عنها) etc, then the nikah done in this state was not valid. If she has now become a true Sunni Muslim in respect to beliefs and practices and you are satisfied, then you should perform fresh nikah according to Shariah.
If it was not clear that she had unlslamic beliefs earlier and now you are satisfied, then too it is better to have fresh nikah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
