How to file for divorce – Divorce advice for women

a friend of mine married an Australian divorce file. He currently lives outside of Australia, Australia has PR. she may divorce outside Australia? or have to file in Australia?

My brother is staying in Maharashtra and His wife is from MP. The wedding took place before 3 years in MP. They have a baby of 1 yr old. They want to have divorce , as the marriage is not going very well. I want to know where can we register the case ? whether the rules are different in both the states ?