Mother of five acts erratically and demands Khula

Just a few months after her fifth delivery and an altercation her father and I had, my wife started acting erratically, left home with kids to her parents, switched off her mobile and her parents don't allow me in their house. She is demanding Khula. Period. It is 16 months since I last saw or spoke to her at the time she left home with her parents. Two kids aged 9 and 8 are living with me for the past one year and the remaining 3 with her. Her father won't accept maintenance money I want to give and instead spreads a propaganda that I don't pay maintenance and left the family to fate and innumerable other lies. My 10 years marriage was a fantastic one and I love my wife and kids very much. All attempts I have made for reconciliation, so far, with the help of elders during these 16 months have failed. Now, she has totally stone walled herself against meeting anyone I send for reconciliation and have has refused to talk. This turn of events has wrecked me emotionally and destroyed my otherwise good professional career into almost bankruptcy and debts. I take care of the two kids with me, doubling down my work as a mother and as a livelihood earner which is turning out to be a very difficult task. She won't show me my other 3 kids nor accepts maintenance and now is refusing any reconciliation. She is demanding Khula. When I want to see my other 3 kids she threatens me with police complaint and legal action and refuse to send my kids to me. She has not called the 2 kids living with me even for a single time and I see these two kids too miss their mother and need her emotional support. I miss my other 3 kids and my wife very much and want to save this marriage. Initially, I thought she is under some kind of post natal psychosis but now after 16 months and her pursuing post-graduation I am not sure what it is. Her parents sternly react to my proposition that she should be diagnosed by a psychologist. I want to save this marriage, what are my legal options under Muslim Personal Law under Hanafi Jurisprudence? She is decidedly intent on Khula, what are my options to bring home my other 3 kids home from time to time while paying for their maintenance, if it ends in Khula? Kindly help me with detailed advice.