She’s your aunt. You should invite her. Don’t pay her any attention, just smile in her face and don’t react to anything she says nor argue with her. 

She is my mother’s sister..but fact is she is extremely jealous so mean and of her deceive character.she repeatedly come to our home n made chaos between my father n mother,spoil my mental peace.many of our rltvs hate her.my ques is on my wedding prog ,if we dont invite her on my occassion (cz i need my mental peace)will it be sinfull fr me?is it mendatory to invite all relatives in wedding?