Can i get an Agreement signed by wife to safe gaurd my married life

Hi SIr, I m married & its being only 2yrs. one day Me and my wife had a small miss-understanding, their parents took her away. While leaving she said "I know how to leave without you". Her Parents said " I will not let my child with you". I never called them. She tried calling around end of 3rd month, I did not pick her call. After 3months they went directly police station with false complaint saying I had beaten her and sent her away from home. Me and My father went to station. And they tried to scare us by telling police to file FIR. We did not bother, Again after 3 months they came back saying to police station again saying, My daughter was harassed for salary. We now took them to Mediation centre. She is accepting mistake. She is saying "I did bcoz my parents n sister said". Now what can be done. She may be innocent, Bt Tomoro again if she goes with same way, My life will be ruined. Is there any way to in stopping this in future. like aggreement if you leave me, will file divorce.