What should i do ?

I get married in Dec 2015 almost 2 year .before marriage I was stay with my parents house ( it was to small for joint family ) than I moved to my own flat . first 3 month was very happy. after that our issues started . on small small thing we start fighting .She was working after marriage but suddenly she left the job and even she did inform me. The problem is after I went to office she goes her parents home every day without informing me. I asked why you are going every day to moms home .every time she replied arrogantly I will go when ere I want to go nobody cant shop me . One day I asked her we both are earning how we can manage things . She replied very arrogantly I will not give my salary to you . My father had taken loan for marriage I will pay off loan. so I asked her you should clear this to me before marriage .She went to her moms mom for 1 month. later she come back stayed with me for couple of month good but her she went mom often One day she was feeling stomach pain (that was only reason )so we went to dr that time I come to know she was pregnant Next day her parent come to take her for form my home and after she stay 10 month with parent. she got delivery but did not inform me after 2-3 day I call form her cosine you had baby. I went visit her. requested to come back but she denied .after 1 month I again went to take her back. her parent had fight me. then I involve my relative and she come back . this period my parent take call to stay with old house with them ( small house later it was rebuild for all ) that she denied stared blame my parent and want separate from them so I separated my family for her now we all where staying separately .she stay for 2-3 month me and again she start fight with me . you don't have right my child . I will not give my child to your parents .and every she goes mom house without informing me . now she is staying with her parent don't want to come back. I am really very depress this time with her behavior . I want divorce form her but I don't have capacity to pay maintain because due job I have shifted other place ( she stay der only 1 week ) and pay rent , emis also I have my own exp. My wife is very qualified ( MCA) but current not working. Kindly suggest me good option. 1.if I file divorce on ground of cruelty than how much maintain I have to pay ( my salary is 30000 take home is 28000 and exp : EMI -16000 , rent paid-10000, rent received -7500 personal exp. petrol ,food , mom dads medical exp. is 5000 balance is remain is 4500 with me. 2.if I want to stay with her how I can stop her behavior to go again again to her mom house and her mom dads interference in our life ? thanks