Mutual Divorce

I have filed for divorce 4 years back and we have been living separately since then. My wife is saying she will sign only once in front of the family court and will take the full alimony amount on that day in front of the family court judge. Both our lawyers are saying that the mutual divorce will not be filed under section 13b since I have already filed the divorce petition 4 years back. In this new petition they will mention closing of Maintenance and Divorce case and if GR case is there regarding FIR that will be mentioned too and closed. My question is the 2 cases of Maintenance and Divorce (which falls under the family court) can be withdrawn by writing the terms and conditions in the petition filed for mutual divorce decree. But what about the FIR which is pending in Mahila PS? How will that be closed? I have not received any notice from the SDJM court before which the FIR case is pending. Does that mean the police (Investigating Officer) has not submitted the chargesheet? If not then how can the FIR which is pending with Mahila PS be closed by citing terms and conditions in mutual divorce petition? If chargesheet has been filed then what is the procedure to close the FIR? I do not want to be in trouble with police once I have given the full alimony amount to her in front of the family court judge. Please suggest me all the possible procedures and outcomes. Also signing just once in front of the judge once and for all is it possible? I thought there are 2 motions always needed.