Uttering words of kufr

My spouse uttered words of kufr. She renewed her Imaan by reciting one or both kalimas, i.e. she may have recited first Kalima only or second Kalima only or both of them. I cannot now recall. She also recited Imaan-e-Mujmal and Imaan-e-mufassal and made tauba. Nikah was then re-performed. Is the Nikah valid even though she may have recited only one of the two kalimas? I do suffer from very bad waswasa regarding these matters, so please bear this in mind when answering.