Sister husband and in laws making fool of sister

My sister got married in the month of May last year and with in few days of marriage her mother in law started abusing her and try to portray that my sister not giving proper treatment to her. After listening to her mother my sister husband also started abusing her. We tried to manage the same by stating my sister not to react and just try to manage the things. Meanwhile he tried for job in Emirates and he got the one but he dont given any information to my sister and not even to us. After reaching Emirates her in laws send my sister to home stating go and enjoy life at her home but when we started calling them to tell us when to send her in laws place they always ignored by stating one or other reasons. Finally we ask them that what is the going so they refused her to entering back to the home stating her husband will take her with him and we won't allow her in our home. Initially he also send money for her livelihood but now not sending any money since last two months. Apart from this not reverting to her call and was online most of the time. I want to take some steps by which he can understand his responsibility and her in laws take her home. Want to know the legal actions which I can adopt for her.