Can a separate living daughter in law claim in in laws property

My sister in law is staying in separate accommodation since last 3 months with her two daughters. They had 14 years married life and since last 2 years both were living seprate in same roof. But three months back one day she gave written statements in Panchyat in front of in laws and her mother that she is separating at her own will and want to live separately. Family members is visiting her to comeback but she us not listening and firing back and telling not to come again. She is working boutique for last 3 years and running her rental accommodation through its earning. My question is does she ask for claims in property of in laws or maintenance allowance as her husband is not earning any thing now, earlier he was a vegitable hawker and earning Rs 200 daily. Her father in laws is army retired person and earning pension of 16,000/-. All land in parental. What is your suggestion as her in laws are on tension. After how much time we can file divorce, can we also seek law support to take back one girl at least.