I have a feeling that the night that Ahir visited Malhar's house, he must have either discussed his plan with Avni or broken up with her.
He must have told her that he only came back to take revenge on Kalma and Moksh. This might have made her think that Malhar was right for her along.
She must have joined hands with him that day when she saved him from Kalma.
From then on, I think she took over and made Ahir try to kill Kalyani and Moksh. If they were out of the picture, then Sarthak would definitely force Malhar to marry Avni.
Once Ahir failed to do that, I think she killed him fearing that her truth might come out.
Also her miscarriage was sort of shrugged off very easily. I think she might have either gotten an abortion or the miscarriage would have happened when she was killed Ahir...he would have definitely put up a struggle.
This girl is giving me psycho chic vibes.
Hehehehe I think @sas79 and I are thinking on the same lines...read her post after posting mine.. 😋