My mother in law threatens to implicate me in false case

Hi, My husband and mother in law are co-owners in the flat where 4 of us live (MIL,FIL, My husb and I). She and her husband wants the house fully to be on their name.and hence are making life of me and my husband a hell ! FIL dont say anything directly but he roams around the house semi naked, sometimes in just undies making me uncomfortable to come out of my room. He has left his room and sleeps just outside my room now MIL has also joined him MIL used a lot of kitchen politics, later verbal abuse and mental torture and games against me, it later escalated to she telling us to manage and buy our own utensils and groceries etc. She even pushed and slapped me on neck/back (when her husband was not at home) for touching her veggies. She then created a huge fuss infront of the maid next morning, again abusing me , my husband adn my parents. Thats when I got done , I told her she tortured me physically and mentally but she cannot say a word about my parents. As her "Slap" secret went out in front of her husband , she blatantly started lying and told her husband who is also a lawyer that I am a liar and I am a threat to her life so she needs protection against me. By then I didnot understand what she meant but I was scared so I went to Police who instead of FIR just wrote an "NC" despite of her raising hand and verbal abuse. I came back , after 2-3 days she again picked up fight and this time she blatantly said, I am going to implicate you in false case and people will laugh that within two months of marriage you went jail. I am really scared because she is no ordinary woman , a) her husband is a lawyer (taxation) b) she had already done all this drill of taking protection etc. earlier too against her husband (who now has returned for property) I have the following questions:- 1. What is the best advice/soln in above? Can my MIL really frame me in a false case? 2.What is NC? Is it of some use as a proof? 3. Why did police not do FIR despite of physical violence? How do I do a proper FIR resulting in her arrest cos I dont want her to self harm and implicate me (she is very capable of that) 4.I dont want to just give in and move to rent because a) they were succed in their intentions to throw us out b) Its very expensive to be on rent in Mumbai , at the same time if I opt to go thru the court way I dont have enough funds to afford lawyers and all associated expenses. IS there a way where in a girl can get a govt . appointed / NGO lawyer to fight her case against in laws?? 6.What is a Protection Officer ??, how can I get one so that my mother doesnt harm me or herself to defame me? 7.I am not originally from Mumbai , so dont know if mumbai has something as CAW women's Cell (I couldnt find them on google), If there are some please suggest I it is same as going thru Police or different?? AND Lastly which option is better for me , proceeding with A) Police, B) Women Cell OR c)Court ?? Pls help ASAP