Here is what may have happened :
First when the task started Prince was saying to kishwer that if indeed time comes that someone has to take cash and leave then i will leave and you wont..
But by the night Prince changed his own words and we saw he was saying that full punjab will vote for him and he can win the show so he wont quit...
So now here is my presumption.. As its too cold there and we have seen Kishwer has some health issue because of which she cant sit for too long and also they cannot eat and drink anything.. So when Kishwer was not able to continue she must have talked to Prince and as we know prince he must have said that he is not going to quit.. So Kishwer was left with only one option that she have to take cash and leave.. BB also announced that one member has to take cash and leave and BB wont change rules.. Because in precap we saw Kishwer crying after she decided to quit.. So may be she didnt wanted to quit but scenario was such that she was not having any other option..
Note : Let the episode air tonight.. I am not saying exactly same thing happened but i think this is one case which might have happened...
Prince so over confidence i seriously want BB9 winner should be from Rochelle , Mandana and Rishabh...