Maitree lost her entire life in a day. She lost her friend, husband and her inlaw hate her. I think in this point she saw that Nandish needs her and as the child represents nandini she got attached to him. Note she is not possessive for the child but the mother I.e Nandini who was in coma and the baby is premature. Already the faith of the mother is unknown and now if the child is not given proper care his faith is also unknown. This lead her to become possessive of him because he resemble something she is possessive about her one true friend Nandini. I don't think she realizes that she is digging a grave for herself. Once who supported her are wary of her and for her. Sona tai even if she hates her knows that a child belongs with the natural mother and too much attachments to Maitree will make her moving forward hard. Ashish parent are grateful and respect her but feel left out and scared for their son, grandson and Maitree. Ashish is aware but helpless. But Maitree is going to be affected badly.