It is possible they changed the plot to suit trps
I guess this was done in Shaheer's absence. Too many segments are floating around. Does not make sense at all.
So this is a build up for Mishti to acknowledge difference of opinion between herself and kunal. Ultimately everything is more or less her way. Yes the plot is not executed well here. I don't know sudden change. Maybe she will resist and badi maa will blackmail her and all frustration is on bali ka bakra Abir.
I think the drama will take place not before the wedding but they r doing during the engagement.
Meenu wants to break the alliance so why not at the engagement. Except for nanu, no one, even Mishti has realised that Abir is in love. If his mother changes everything this time, there will be a character change altogether.