There are many possibilities:-
- IJA is not Kabir's real Mom. Maybe somewhere she is related to Karan. Karan maybe her son.
- IJA wants Dumbiti's money, but maybe she wants it for some good deeds, which may trump her as a 'good' assassin later in the show.
ya..i also doubt karan sometimes..what if the story proceeds like this..kabir is nor her son..bur her real son is karan..when aditi is dead tha blame may go to kabir and she and karan may get 900 crores(just a thought)