False case filed against father-in-law under disha act

My son is working abroad and my daughter-in-law is staying with us 8 year old daughter. She along with her mother harassing us mentally and defaming us at every junction in this old age. She recently went to her mother's home and stayed there for two months, later she came at her will to us. Then again recently she made a false drama of suicide by closing herself in a room and consumed two sleeping pills, for which we have broke the doir and took her to hospital and spent a lot to make her healthy. Again she filed a complaint against us in police station and went to her mother. Now there is a dispute between she and her mother, now she wants to return home. We afraid that she may cause any harm to us or her self for which we are responsible, so we said my son is returning home by the end of may 21, then u come and setup ur own family as u wish. Now she filed a complaint under disha act against us, and also complained in foreign ambssy against my son. She total harassing and defaming us. At this age we r suffering with sugar and bp we r unable to tolerate this. Plse help us how to comeout of this cases. Shall we file a case against her to save ourselves. We r totally saying after her husband returns u live separately as u wish, but she is mentally harassing and defaming us in society.