Wife Demanding 15 Lakhs rupees immediately

I was married with a girl about 6 months back. From the day one of marriage, She always ran to her mother house by making different excuses. She always complaint and fight about my old widow mother, my dark complexion, our small house and other issues. Now, She doesn't want to live with me anymore and want to marry some other guy in her neighborhood. She filed a complained against me and my family member in Mahila Thana (NCW) on 25th July 2018 to extort 15 Lakhs rupees. She put very serious charges against me and my family members for dowry harassment, attempt to murder and even rape charges against my elder brother. We are even ready to pay her this huge amount of Rs 15 Lakhs to her but she wants the money immediately without waiting for the file of divorce otherwise telling us to face the consequences. Sir, We are living with fear and don't know how to handle this situation. Please suggest me on the following points: 1. Is there any way to legally bind her in some contract/agreement so that after giving her 15 Lakhs rupees she never ask for the money again. 2. This case is of UP, Please explain me the procedure on how to protect my elder brother by going for anticipatory bail or stay from arrest. My elder brother lives in Banglore but the rape incident she was referring was of 26th June when my elder brother was at home with her wife and other family members. 3. How to file for divorce and in how much time it can be granted. 4. Any advice on this issue.