Ever heard about collateral damages? Both Tanya and Anami are just that. Being a woman do i like another woman been subjected to dirty game? NO. Yet this is a fact. Well speaking about Pujan he is lethal guy and has very low morale. The guy who is ready to sacrifice his own son can go to any extent.
Most of the time we see a woman as the other woman's biggest enemy.. So I am not surprised when Sudha wants to go after Anami. Well she is sick at all the levels and so to think that she can have a mercy on any other lady is outright foolishness. Look how she treats that nurse/friend of hers.
The lady who does not love her son and treats him like a weapon can go to any extent for her revenge.