first let me start with the pain i felt in ovi's voice...to me it was really pain, to me she is not even aware she is manipulating purvi she was begging...ovi situation can be said in a quote from ayn rand
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"Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone."
Ovi reason's is that arjun still loves her, she is in denial and there is no bringing her back from this denial..no matter what anyone does ovi is not going to stop her nonsense..her madness should be leaved alone and purvi should not count on her bringing her parents back...
Now coming to purvi..can we all say if we were in purvi's shoes that we would not even think of sacrifing for a moment..if we didn't think than to me we are selfish...when she was talking to her mother she was still thinking..hence she lied...however, if she goes to sacrifice arjun then she would be stupid...purvi is not in denial she is a realist..and being so she did not get the affidavit done...which means she has accepted her parents are getting divorce...also by now she should have realized if she does sacrifice arjun neither arjun nor ovi will be happy..that's the reason she stop sacrificing in the first place..arjun has convinced her that much...
and i now i am almost certain that the wedding will take place...what reason does she have to stop the wedding...what would she tell arjun, the truth? arjun will never accept it..he will tell what has happen to manav and archana and might have a talk with ovi...a talk in my opinion he should have had with her a long time ago..
her second choice would be to show arjun that she is marrying him for the money, like it was shown today-arjun might be taken aback but he will not believe, and when this happens archana will 100% not believe..she will know something is wrong, she will figure it out and put purvi in the right track...
the third choice would be to run away...the least likely to happen, if this happens soham will become the main suspect...also arjun and archana will find her..he will not stop until he finds her...
to me, no matter what purvi chooses arjun or archana will be there to stop her...they will not let it happen..sharvani was pregant with sachin, so arman decided to sacrifice their love because there was a baby involved, purvi does not need to sacrifice arjun to bring her parents together she just needs to tell manav or the court about the fake signatures...and she should know by now no one will be happy truly happy if she does indeed sacrifice...not even her sister ovi and never her mother...the burden will be to great for archana to carry...