Just like piddhi married shwetha for hadapping her kid for bhabhi..just like shwetha kidnapped rishithas kid for getting revenge for the sufferings which started becz she didnt want to be the mothr of her own kid..
I know no other character on the show makes sense either so it's wrong to expect her to, but the way she flipped from wanting to show him to her mother to make her realise her error in wanting her to marry a guy from there to becoming stubborn about marrying him just because he is Dhara's brother-in-law. At least she could have given it some thought or time for planning and plotting before deciding that.