Uttering statements of disbelief
Q: My wife was frustrated because of something and she said repeatedly that she is no more Muslim. But now she is worried about that and needs to ask about the status of her religion and we are also worried about our nikaah.
A: It is better that she recites the kalimah and renew the nikaah as well.
And Allah Ta’ala (الله تعالى) knows best.