So Anurag played dirty and from what I understand from the written updates (no, I don't have the motivation to watch) he beat Bajaj at his own game and is now the owner of Bajaj's company, home and what have you - So Prerna basically made a deal with Bajaj only because she feared Bajaj was going to stomp on Anu's business and bring the Basus to the street (based on Bajaj's threats and how he blackmailed her) ..but given that that has been taken care of ..can our lady seek divorce from Bajaj and reveal her true reason of marrying him to Anurag? ..she has no reason to stay put with a guy who blackmailed her into marriage, who kept away the fact that he had a daughter and that daughter needed Prerna, it was a deceitful marriage that Prerna now has NO reason to be a part of. Being the person that she is, Prerna can offer to look after Sneha and be there for her ..but not as a forced mother!!
The whole reason why prerna even succumbed to this marriage by sacrificing her love and hurting the man she loved so immeasurably was to save him from being on the streets but now he's taken over Bajaj and has an upperhand - and yes, under normal circumstances you'd want a wife to be loyal to her "husband" but in this case there is no equal man and wife relationship - a forced marriage where the man blackmailed the lady into marrying him and kept away facts about his life is not something the wife needs to be loyal to!!
Actually Prerna can just take a break from all the men around her who are trying to control her actions and just live by herself ..she lost her father recently and her mother and siblings could definitely use her support and company!