Sudden child support ask owing to property matter gone to court

This looks very complex case to me however I am sure legal team can some eye opening views on it. My divorce proceedings started first and I was given ex-parte as my wife accepted an notice but start separate proceedings in a different state/city and sought her own ex-parte. She enjoyed by making me suffer by blocking access and not letting a relationship develop with my kid. I amde several attempts however I did not file for visitation legally owing to job and also because I didnt want the child to suffer anymore. My ex wife also enjoyed because her name was on flat registration and it is only me paying for the EMI right from start. So after initial transfer of some money I refused to become her free ATM card. Years of request to solve did not help. Once i even said I will transfer the house in her name and whatever I paid for 7-8 years I dont want. She can pay remaining term and keep the house. To this she was taken aback and asked why ? I said I am ready to lose this big amount for peace of mind. Now after years and year I took the flat issue to court because she said you feel free to go to court. And now that proceedings starts she is feeling the heat because flat is not in her state and she has to context in another state. So now she reached out to my lawyer stating she will raise child support. Child support suddenly after 10 years ? it is evident this is to start new but she is desperately calling however I am firm I want to solve things legally, please advise situations in this case. Note - I do not have her decree or order copy and all these 10 years she never bothered to discuss support because she was happy that she has cheated the child of 10 years of childhood and also her name is there in flat so why bother. Only now that things are going to legal she started this.