There can be no assurances at all - even where women have agreed in their statements to courts not to pursue legal remedies - they still can later - because any agreement whereby any person gives up his legal rights is bad as per the law.
Marriage should be unconditional . and understand it , if you both dont share a level of understanding , dont waste time . And your mother-in-law is the one who has given birth to your wife .She would never want her daughter to break her marriage . And i dont think your wife has no brains and she wears Diapers . She knows for herself what she does .So why you worried . And things are not so critical that you directly rush to court .By dragging a relationship called marriage to the court on such petty isssue is not something great you have done . Sit and work things by discussing . By going to court you just adding up to pressure onyour wife and you.
you have filed a case under the sections of law which is compoundable. Hence ,you can file a memo before the court and depose before the court by turning hostile.
Before this ,you get a written undertaking from your in-law that if she interferes and disturbes your peaceful life you should be free to file fresh case against her. Let this be done in the presence of your family elders.
Better solve your problem by resorting to mutual understanding,you have no case to seek assistance undertaking is of no use , as opined by Mr, Bharat Chug . cpompondable offences can be ended up without turning oneself hostile in the court .