Mahima ki mahima

How come mahima knows that private investigator is coming to the party ? And how will she recognize? Abhimanyu will not introduce him to everyone saying this is Mr. PI whom he has hired.

And this envelope..It's not any shagun ka envelope that she can hand over to that investigator directly or indirectly.

Does she wants PI to say someone anonymous handed him this letter stating accident caused by goenka sisters with arohi in driving seat and then arohi and everyone blaming akshara...😡