Yes she has a Parivraja/Pravarjya yoga due to moon in navamasa of mars aspected by Saturn in Rasi and this could lead to MIL problems as you indicated.
But your 4th house indicative of mental happiness in family life is deficient with a very poor potency for the house and you will have to put up with your MIL. Running away from her will not solve your problem. There there will be other problems. A known devil is better than an unknown one.
Read navagrahastro.blogspot.in to understand the method of evaluating a horoscope.