"disappointed with mums care"

My mum was recently an in patient on ward D1. She has Dementia so sometimes struggles with everyday things. When I arrived to pick her up to take her home, she had on her underskirt & coat but no jumper, no knickers on & a shoe on 1 foot & a slipper on the other foot. I feel this lacked care, knowing her condition surely someone should have noticed the state she was in & assisted her with dressing.