she was first shocked to see Geet in Maan's room and then now when Geet said they were alone in a house, she said that it is too much.....
before Geet confesses, Maan will go out somewhere and Dev too will not be at home and NT comes home and when NT sees Geet , she will come to know that Geet is Maan's mangetar.....out of insecurity she will somehow tell Dadi that she is pregnant....and then when Dadi asks Geet, she will tell it is true and might also tell that Maan knows about it.....but she might not be in a position to tell anything more especially after coming to know that Dev is Maan's brother.....Daadi might then accuse Geet telling she has taken advantage of the goodness of Maan and this and that.....then Dadi might ask Geet to leave the house and when Maan comes home, Daadi might tell him that she has left or she herself might leave some letter at outhouse which might make Maan to misunderstand Geet or he might start thinking that she does not love him at all and does not want to get engaged and that is why she left....