Your ideas are interesting, but Birwa theory is most likely since she wasnt shown yest her reaction to santu's arrival wasnt shown, by this I mean her inner thoughts , so its probably her doing for daddy. also if birwa'is also negative, santu's tyaag Will be useless, as she herself now started telling shanky. No way this can be as her mahaanta has GOT to be shown as valued by ekta
in Ekta's dictionary Mahaanta means Suffering.