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As per future from current epis, it's look like she'll lose her mental balance, will go in depression after Sam's death, if it's fake or real time will tell, but maybe Doctor will ask them to take care of her and do whatever she say to do, she'll claim Virat as her husband and he'll not deny and play along considering his guilt for Sam's death and also she's DIL of the house so it's his responsibility to take care of her after her husband's death, Sai and family might support him but eventually fallout will happen between Sairat,
This is what I feel too. This is what happened in KD. Infact whatever you wrote is full KD. But for immediate 2-3 months, they will opt for this.
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