Harassment by Daughter in Law

Dear Sir, This case is related to my son who works in a software company & based at noida. he got married on Dec 15, 2018, & when my daughter in law came to our house & She started making stories & allegations against me ( mother in law )& my husband ( father in law). However, we have sent her back along with husband after 20 days. She was too lazy to do household work not even cooking for her husband ..so they started fighting for these issues ...She sleeps the whole day more than 18 hours & doesn't give importance to her family life. In the last 8 months, she lived for 5 months at her parent's house in Rampur. No again they fight on the siliy issues on dated 8th aug 2019 & she left the husband's home & went to her parents . Now from there ( Rampur) she filed FIR against me ( mother in law )& my husband ( father in law) & my son under section 498A, 323,377,504,506,3 & 4 . Rampur Thana Police has asked us to come on 28th August Even though there is no involvement of ours , she willingly mentioned our name in the FIR & leads us to mentally harrasment . We both are senior citizen & also having medical issues . Kindly guide us how to come out of this situation . We are not able to sleep . Daughter in law family is very greedy & i think they are doing this to get money from us ..