Looking at the precap it look like sai managed to tone down kaku. I don't think kaku changed for real. She is not a silly vamp to feel gulity with mate kumate talk. She is that mother who kept her daughter drugged and mentally unstable for years. So this looked like sai's blackmail effect.
But after this harini track will start and i feel she will manage to win kaku's heart. She may feel gulity for keeping her away after watching devi and harini together thus will feel sai right for first time and will ask her to stay back.?
Since makers are stressing "sai will leave" again and again.. They can't make sai stay back just like that.. 🥴kaku herself stopping sai will be a dhamakka for sure ☺️
Ps: just imagine didi 's face if this happens.. Badi mami aap meri bezzatti ki 😂😂😂😂😂😂😂