Renewing one's nikaah if wife said words of kufr
Q: Mene ek behes ke waqt keh dia apni biwi ko ke kya “tum khuda ho”
She said yes... Now the problem is that she said that she didn’t say yes but I am sure she said.
1) Is this kalimat e kufr and will the person become kafir?
2) Do I need to do renew the nikah?
3) Do I need to give a separate meher for nikah?