but ... i have this strong feeling that this Amba Daku is the biological daughter of Amma and so we can notice that strong bitterness everytime she speaks to her....remember, she calls her by her name with a lot of bitterness, maybe because she as a mother to her had failed in her duties, and left her to die...that was her good luck that she would have survived that attempt of female infanticide...and so she is filled up of all hatred and bitterness for this lady.....
and that is why, she said very bitterly yesterday..betiyon ko toh tu jeene hi kahan deti hai..isliye bahu hi hongi......(something like that)......when the ladies of the household were being introduced to her...
and yes, as far as the escape of Raghav is concerned, i feel, Amba has nothing against Raghav, so she wont harm her..he is being kept in captivity just to weaken that Ammaji....so eventually, after her target of dethroning Ammaji and humiliating her is achieved, she on her own would relieve Raghav (who I hope turns out to be her real brother)....it was a mother who failed her duty in love of her sons.....so she is the only target.......
what say... i hope i am correct......because then only the story can gain some interest, and not by just showing a Daku Story (just like the earlier DM wala super flop sequence or for that matter that Sonali wala one).