Court decree on partition

The partition suit that was compromised among the parties to the suit is a different suit, now your wife's aunt's case is a different suit.

Perhaps your wife's aunt was not a party to that suit, if at all she has any rights or interest in the properties where she claims her legitimate share, then the court will decide the case on merits.

Therefore without knowing the background details, any opinion given here especially with regard to the pending suit would be a misguidance and prejudice to the subjudice matter.

Facts, as posted,  too disjointed and is too vague to be understood. Please repost.

Incomplete and vague facts cannot lead to form proper opinion and oblige. 

Consult a local prudent lawyer for  proper appreciation of facts and professional advise.

The Compromise Decree which was passed in 2015 will not be cancelled or becomes void but your wife can submit in the OS case about the compromise deed which has been signed under coersion so that a fair trial can be made about. 
Rest the fcats of the case are lvague, kindly give full detail for better guidance. 

A compromise decree stated to have been passed in 2015 has attained finality, which cannot be challanged.