The actress is so good that at the end of today's episode she made me scared and thoughtful about what is going to happen next. After Arnav explained Khushi's background about her being orphan and how her parents died in a car accident - Dadi's face showed a smugness saying checkmate. It could be either one of these things running through her mind and what she is going to do next:
1. After hearing that Khushi is an oprhan and that her parents died plus Garima is Payal's mother - I think Dadi thought that this is not the same Garima from Arnav's past. Because that woman is not married and doesnt have a child or that woman didnt die in a car accident (Khushi's parents might not have died in a car accident but Khushi was told that by Garima).
2. Or Dadi might have thought this is it - Khushi is an orphan and she can use that to stop this wedding. She might say that since her parents died than what is her caste family status etc.
Whatever that was on her mind she definitely has a plan as she is trying to stop Arnav from coming with them for the Shagun. She knows if Arnav's with them he will never allow her to insult the Gupta family and she will not be able to break this marriage.