Aunt wants share in Mother's property that was gifted by grandmother

hi my maternal grandmother gifted a agricuture land to my mother as a gift deed after 13 years of registered deeds now my aunty wants equal share in that land and the land was gifted by father in law of my maternal grand mother and grand mother gifted to my mother but my aunty wants equal share pls help us according to muhammadan law thanks.and my aunt registered a case in court