There are quite a few reasons behind Anu's surprise, I think. You see, baa had gone all maang bharo once and tum shaadi karlo when Anuj went to live with Anu for a day. So even if there was disapproval for their relation, Anu was living in the mu that atleast their wedding would be blessed by baa.
Unfortunately, the daadi- shaadi nonsense cropped up. Now, yes Anu was well aware of samaj and all, but in that moment with the love of her life sitting right by her side, she felt confident enough to take the bull by the horns and said yes to the marriage. And if things had gone accordingly, Anupama would have been mentally prepared while mentioning marriage, to baa. But our hero's drunken outburst in the mohalla ended up putting baa in a spot, who then out of ( absolutely hypocritical) fear of society, manipulated Anupama by citing main mar jaaoongi.
Ask me, and I'll say that the 🐘 was in the room but Anu had been ignoring it's presence to keep her sense of peace, and simply bask in warmth of Anuj's love. But the bubble broke, and she was forced into a situation where she has to take an absolute decision.
And the most unexpected variable happened in the form of Anuj only. Anu wasn't expecting him to serve a ultimatum of his own so that's where her reaction has stemmed from ( and also makers like to show Anupama as someone who says things she never applies! So there is that too)
Answer is very clear to Anu. Anuj ko chodne ka sawal hi paida nhi hota. All she has to think over, is to how to break this news to her fam.
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