Well may be this is what she wants. Push people away before they hurt her more. This is what she did with her husband.
According to Nani she was tough on Koki growing up to make her strong enough to stand up herself. Koki did not know this until Nani told her but Koki is already set in her ways and she keeps people at arms length. Only person she let come close is Ahem but now even he has other priorities and she can't stand this and is now reverting back to a hateful person.
i agree shilpa...but the thing is nobody trying to hurt koki or take her place...its all in her head...also like most say i dont think the cvs are changing her character...these are kokis characteristics...they were just dormant for a while...everything was as she wanted...now a slight ripple and she is not able to bear it...