It looked hurried and most of us will be left wondering why Bhavani gave in at the count of 5. She has made it clear that she's doing it for "Ghar ki izzat" and it should not be seen as an acceptance of the marriage or Sai -- this is true because, at face value, it is a complex issue of prestige. Beta apni pasand ki bahu lekar aaya toh log baatein karenge lekin agar wo Ghar chhodhh Kar chali gayi to naak kat jayegi.
But despite that being the underlying reason, it is not the only one. I think today's scenes - the focus on Bhavani and Sai more than anyone else is an indication that Bhavani has gauged Sai's tenacity. She knows she won't be able to walkover the "junglee mulgi". It does not mean that Bhavani will soften anytime soon or not harass or taunt Sai but it means that something about Sai has struck her.
Loha lohe Jo kaat ta hai. Bhavani is someone who is authoritarian and narcissistic to a point so far ( we have no back story of this generation so just from what we have seen). Her issue, as Ashwini mentioned, is not just the fact that Virat married an 'unworthy' girl outside the caste but also that her strength, power and position is being challenged repeatedly.
Bhavani has recognised Sai's strength and knew that Sai will live up to her challenge and walk out of the house (of course, Virat in tow by default). But to an extent, I think Sai's courage has also shaken her (in an unimpressive way). In the days to come, it will be worth watching whether this dynamics of power within the family will shift towards Sai-Ashwini and how Bhavani uses Sai's own strengths to pull the tug of war.
But, Sai has been noticed -- by Virat and also Bhavani (i don't think the opinion of her train of nakalchi Bandars matters that much anyway 😂😂)