Dream of

My mother in law has reccuring dream about two women one tall and one short,they are both dressed in black dresses,have long black hair,no faces and,no shoes.my husband and I are with her in the lounge.then suddenly they burst in,grab her,hold her down and the tall one puts her hand around her mouth,she struggles with them.They take no interest in myself or my husband,whilst struggling,she is woken from her sleep?