i was abt to write dat DD is doing everythng for rosh only n dey actually show dat in d show...
Center of DD's life is only roshni...she s trying to accept sid jst for her n she has fear dat if she ll insult sid den Rosh will left her again n dis tym may forever...
DD love her daughter immensely and will do whatever it takes maintain that relationship even if Roshni becomes cognizant of Ravi's hidden secret and walks out on Sid.