Wife uttered words of kufr unintentionally;nikaah

Asalaamu Alaykum Mufti Saheb,

This query is on behalf of a friend who is in a severe state, in his own words:

I have been accepted for Hajj and my wife was not, on receiving this news my wife became very depressed and disappointed and expressed some words of anger directed at Allah. She did repent soon after realizing her mistake and asked for forgiveness however out of deep concern she feels there were words of kufr and recited her Shahaadah again. Does this affect the status of our Nikah?

Please advise