My wife seeks divorce, but I don’t want

Hello sir , I have been married for 18 years and and its been 4 years since we are living separately. And no cases of any kind on me till day . She is working in Central government and i am working in private. Her salary is 1lac and mine is 2 lacs and we have a daughter who is 16 years old now. My questions are. 1) Can she file DV / 498 A or any other cases on me , even after we lived separately with absolute no contact from 4 years ? 2) Can she file a maintenance for herself and child .? 3) Is she eligible for getting the maintenance from me even though she is working ? if yes how much , any formula for this ? 4) How much court may ask me to pay maintenance for kid and until when ? ( till she becomes major )? 5) Can my wife come back after few years to claim the ownership of my property ? 6) apart from salary i have some amount in FD as a liquidity + 1 house + 1 empty plot ( all i earned and apart from this i may get some share of property / money from parents ) , whether this will also be considered for deciding the maintenance for wife and daughter or salary alone will be considered. 7) I may loose the job any time soon, but as per many , still we have to maintenance . Totally confused on my scenario . Kindly help me understand what could happen if she files any of the cases ( 14 years we were good to each other and she was good with my parents also , not sure what made her to take this decision. she tool this decision while i was away from house for few months on job )