TFS
Balika Vadhu: Harkhi gives Urmila's jewellery to Kundan to help him. Meanwhile, Kalyani gives Mangla a gold kada' as a mark of respect for her affection towards Nandini and her family.Kalyani does the pooja and blesses Nandini. Anandi tells Kalyani that she will be shifting to Shiv Niketan with Mangla and Nimboli. Kalyani, Jagya and Ganga request her to stay back
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I think before all these scenes there must be some Anandi Nandini and Nandini Dsa senes.
Tthe shrewd old lady Dsa must have come to this decision only after someone to one interactions with Nandini.
So Dsa's attempts at getting Mangala out started only after what she has done and said and what she is doing with the child.