I think no one will believe me but I feel that kaku doesn't really hate sai
I know in other versions Kaku turns against sai completely
BUT
What I feel is...
Kaku has handled whole family together if she wasn't there than this family won't be together( Virat said so on their reception day)
Kaku felt sai has the guts and that power to question the wrong things
After her only sai can manage this family
So she wants to train her by being strick
As she already knows that ashwini will be soft toward sai so she will be the strick one to guide her
( normally parents does this, one of them will be strick and another one will be softer )
She does challenge her so she can get to know how will she handle such situation
Remember on reception day she said that 'kyu tumne b to ghar chhodne ki dhamki di thi'
Does anyone feel the same or I am just analysing way too much? đ¤Łđ¤Łđ¤Ł