Defence when apprehension of being booked under false charges

I am having a doubt on my sister-in-law that she might lodge a false police complaint against me. Let me tell you why? She is getting separated from my brother-in-law and she had asked for an alimony (18 to 20 Lakh) from my wife's family but my wife's family didn't give that and in return, they had filled a case against her. So now the case is going on in the court from last 3 to 4 months and she is not finding any way to recover this amount. My father-in-law and mother-in-law have a lot of love and affection towards me, so now my sister-in-law is planning to file some kind of case against me as I will be leaving for Europe in Sept 1st week for my post graduation and she doesn't want that to happen just because she wants to take a revenge. So, my query is... 1.Can she file a false case against me without any proof? If yes then what all kind of sections can she apply? 2.What are the pre-requisite steps which I can take just to safeguard things from my end?