I had the same thought. Even discussed this earlier when I said that I want Sonali switching sides to Sai.
BK knows that Sai is unstoppable and a challenger to her. So putting her down is her only motive and to do that she is using Pakhi.
I think somewhere she knows V loves Sai and won't get into a relationship with Pakhi. But this constant power struggle will keep the control of the household with her. It's a proper divide and rule policy. But in all this, she doesn't even care what effect it has on Samrat. V-Sai ko pareshaan karna is the motive. Sammy is collateral damage.
Sonali is 'jee huzoor' types. She will bow to anyone with power. So if Sai is the one in control Sonali with flip to her side. That would be interesting to see.
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