Advice regarding Domestic Violence, Alimony and Divorce

1. My sister is from delhi and married in Chhattisgarh in 2004. She suffered domestic violence for 12 years.. Having 1 daughter and 1 son. she tried everyhing to control her husband but when her husband's cruelty has reached to extreme she decided to leave to save her life. 2. She filed a complaint in local police statio n there in 155 for domestic violence and came in delhi with kids in july 2016. 3. In august 2016 she filed a case for domestic violence through government lawyer in delhi.. And lawyer did not do much in case till now 4. Her husband filed a case under section 9. In december 2016. She couldn't go there but wrote a letter to concerned for not being there. That letter is in courts record. But that court has made a one sided decree against my sister. 5. Her husband now filed a case for divorce upon that decree In his state. He is not willing to give anything for alimony. He wants divorce to get rid of his responsibility but sister doesn't want to divorce.