I also feel that AS created a BIG MU between Anu, Sarthak, and Malhar 5 years ago.
I really don't understand why Anu would believe out of nowhere that Malhar would shoot her daughter, the person he loved so much. Based on those flashbacks of 5 years ago, Sarthak seemed to have been stuck in between Anu and Malhar. And in today's episode, Anu said that Sarthak left her when it seems like she left Sarthak.
AS was also extremely scared when Malhar disclosed that AS was paying for Trilok's medical bills. So I am sure she teamed up with Trilok to plan something that day on the cliff.